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gcc emits -Warray-bounds warnings #834

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hebasto opened this issue Oct 18, 2020 · 12 comments · Fixed by #841
Closed

gcc emits -Warray-bounds warnings #834

hebasto opened this issue Oct 18, 2020 · 12 comments · Fixed by #841

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@hebasto
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hebasto commented Oct 18, 2020

While compiling the bitcoin master branch (bitcoin/bitcoin@80c8a02) having the following warnings:

$ gcc --version
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ make > /dev/null
In file included from src/secp256k1.c:16:
src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
  496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
      |                                   ~~~~~~~~~~~~~^~~~~~~~~~
src/ecmult_impl.h:565:42: note: while referencing ‘ps’
  565 |     struct secp256k1_strauss_point_state ps[1];
      |                                          ^~
src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
  502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
      |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
src/ecmult_impl.h:565:42: note: while referencing ‘ps’
  565 |     struct secp256k1_strauss_point_state ps[1];
      |                                          ^~
@elichai
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elichai commented Oct 18, 2020

This looks like a false positive.
on line 574 we pass num=1 then according to the loop on 460 no will also be 1 when the loop ends.
then on line 495 the loop will never enter because the np = 1; np < no condition is false (1<1)

@real-or-random
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Yes, I think that's a false positive... I've seen this one too. It's gone on GCC 10 (tested with 10.2), even with -Warray-bounds=2. Should we do something about his?

What's not great however is the other call to secp256k1_ecmult_strauss_wnaf: (This is currently unused dead code for future applications, so this is not at all an issue currently):

secp256k1_ecmult_strauss_wnaf(ctx, &state, r, n_points, points, scalars, inp_g_sc);

Here we pass an unsigned size_t n_points as the 4th argument (int num) to secp256k1_ecmult_strauss_wnaf. I suggest we change all the counter variables inside secp256k1_ecmult_strauss_wnaf to size_t. Apparently we do this in the corresponding code for pippenger but not here. See around

static int secp256k1_ecmult_pippenger_wnaf(secp256k1_gej *buckets, int bucket_window, struct secp256k1_pippenger_state *state, secp256k1_gej *r, const secp256k1_scalar *sc, const secp256k1_ge *pt, size_t num) {

@gmaxwell
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gmaxwell commented Oct 21, 2020

IIRC it's trivial to get rid of by refactoring the loop into a do while... sorry, I noticed this months ago (its only in compilers I don't usually use and only happens with endo enabled) and talked to sipa about it but neither of us opened a pull request. (I had a patch in a pastebin, but it expired...)

@real-or-random
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There's a small chance that this is related to #839.

@hebasto Can you check if the warning disappears with this PR?

real-or-random added a commit to real-or-random/secp256k1 that referenced this issue Oct 26, 2020
real-or-random added a commit to real-or-random/secp256k1 that referenced this issue Oct 26, 2020
@real-or-random
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IIRC it's trivial to get rid of by refactoring the loop into a do while... sorry, I noticed this months ago (its only in compilers I don't usually use and only happens with endo enabled) and talked to sipa about it but neither of us opened a pull request. (I had a patch in a pastebin, but it expired...)

Are you talking about his loop?

for (np = 1; np < no; ++np) {

It's not clear to me do refactor this into a do while.

@sipa
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sipa commented Oct 26, 2020

It's not clear to me do refactor this into a do while.

This works for me:

diff --git a/src/ecmult_impl.h b/src/ecmult_impl.h
index 057a69c..c474fc3 100644
--- a/src/ecmult_impl.h
+++ b/src/ecmult_impl.h
@@ -491,15 +491,14 @@ static void secp256k1_ecmult_strauss_wnaf(const secp256k1_ecmult_context *ctx, c
      */
     if (no > 0) {
         /* Compute the odd multiples in Jacobian form. */
-        secp256k1_ecmult_odd_multiples_table(ECMULT_TABLE_SIZE(WINDOW_A), state->prej, state->zr, &a[state->ps[0].input_pos]);
-        for (np = 1; np < no; ++np) {
+        for (np = 0; np < no; ++np) {
             secp256k1_gej tmp = a[state->ps[np].input_pos];
 #ifdef VERIFY
-            secp256k1_fe_normalize_var(&(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
+            if (np) secp256k1_fe_normalize_var(&(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
 #endif
-            secp256k1_gej_rescale(&tmp, &(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
+            if (np) secp256k1_gej_rescale(&tmp, &(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
             secp256k1_ecmult_odd_multiples_table(ECMULT_TABLE_SIZE(WINDOW_A), state->prej + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &tmp);
-            secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
+            if (np) secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
         }
         /* Bring them to the same Z denominator. */
         secp256k1_ge_globalz_set_table_gej(ECMULT_TABLE_SIZE(WINDOW_A) * no, state->pre_a, &Z, state->prej, state->zr);

#841 also silences the warning for me. Sorry for not pointing this out earlier, I had been seeing that since a few months, but forgot about it as it only triggered when the endomorphism was enabled.

@hebasto
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hebasto commented Oct 26, 2020

This works for me:

--- a/src/secp256k1/src/ecmult_impl.h
+++ b/src/secp256k1/src/ecmult_impl.h
@@ -491,15 +491,14 @@ static void secp256k1_ecmult_strauss_wnaf(const secp256k1_ecmult_context *ctx, c
      */
     if (no > 0) {
         /* Compute the odd multiples in Jacobian form. */
-        secp256k1_ecmult_odd_multiples_table(ECMULT_TABLE_SIZE(WINDOW_A), state->prej, state->zr, &a[state->ps[0].input_pos]);
-        for (np = 1; np < no; ++np) {
+        for (np = 0; np < no; ++np) {
             secp256k1_gej tmp = a[state->ps[np].input_pos];
 #ifdef VERIFY
-            secp256k1_fe_normalize_var(&(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
+            if (np) secp256k1_fe_normalize_var(&(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
 #endif
-            secp256k1_gej_rescale(&tmp, &(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
+            if (np) secp256k1_gej_rescale(&tmp, &(state->prej[(np - 1) * ECMULT_TABLE_SIZE(WINDOW_A) + ECMULT_TABLE_SIZE(WINDOW_A) - 1].z));
             secp256k1_ecmult_odd_multiples_table(ECMULT_TABLE_SIZE(WINDOW_A), state->prej + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &tmp);
-            secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
+            if (np) secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
         }
         /* Bring them to the same Z denominator. */
         secp256k1_ge_globalz_set_table_gej(ECMULT_TABLE_SIZE(WINDOW_A) * no, state->pre_a, &Z, state->prej, state->zr);
$ make > /dev/null
# no warnings :)

@hebasto
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hebasto commented Oct 26, 2020

@real-or-random

There's a small chance that this is related to #839.

@hebasto Can you check if the warning disappears with this PR?

#839 seems actively developing now. Let's wait for a bit more stable state, at least until the next morning in my tz :)

@gmaxwell
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uhg. please don't litter the function with conditionals to suppress an outright spurious warning.

@sipa
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sipa commented Oct 26, 2020

@gmaxwell I'm trying to remember what the "simple fix" is we had a few months ago, but I don't think it works without the conditionals. In any case, #841 seems like a much better and simpler change.

@gmaxwell
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gmaxwell commented Oct 26, 2020

I thought it just had one (around the whole block), but perhaps not-- perhaps I didn't like it either and thats why it didn't get PRed. :)

@hebasto
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hebasto commented Oct 27, 2020

@real-or-random

There's a small chance that this is related to #839.

@hebasto Can you check if the warning disappears with this PR?

Tested #839 (5fd2742). Warnings are still emitted.

fanquake added a commit to bitcoin/bitcoin that referenced this issue Oct 29, 2020
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
sidhujag pushed a commit to syscoin/syscoin that referenced this issue Oct 29, 2020
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
UdjinM6 pushed a commit to UdjinM6/dash that referenced this issue Aug 10, 2021
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
5tefan pushed a commit to 5tefan/dash that referenced this issue Aug 12, 2021
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
gades pushed a commit to cosanta/cosanta-core that referenced this issue Nov 5, 2023
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
gades pushed a commit to piratecash/pirate that referenced this issue Dec 9, 2023
6c0259f Squashed 'src/secp256k1/' changes from c6b6b8f..3967d96 (Pieter Wuille)

Pull request description:

  Nothing important changed, but this silences this (erroneous) warning in certain GCC 9 versions:

  ```
  In file included from src/secp256k1.c:16:
  src/ecmult_impl.h: In function ‘secp256k1_ecmult’:
  src/ecmult_impl.h:496:48: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    496 |             secp256k1_gej tmp = a[state->ps[np].input_pos];
        |                                   ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  src/ecmult_impl.h:502:139: warning: array subscript [1, 268435456] is outside array bounds of ‘struct secp256k1_strauss_point_state[1]’ [-Warray-bounds]
    502 |             secp256k1_fe_mul(state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), state->zr + np * ECMULT_TABLE_SIZE(WINDOW_A), &(a[state->ps[np].input_pos].z));
        |                                                                                                                              ~~~~~~~~~~~~~^~~~~~~~~~
  src/ecmult_impl.h:565:42: note: while referencing ‘ps’
    565 |     struct secp256k1_strauss_point_state ps[1];
        |                                          ^~
  ```

  (see bitcoin-core/secp256k1#834)

ACKs for top commit:
  fanquake:
    ACK 5803f5f  - performed the update myself and got the same change: [check_20257_subtree](https://github.com/fanquake/bitcoin/tree/check_20257_subtree).
  hebasto:
    ACK 5803f5f, tested on Linux Mint 20 (x86_64) with `gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0` -- no warnings are emitted.

Tree-SHA512: 386281d23aee93a3b1d1a09fec8319c3a477e46967430c935677eed54abddc62d5a7710f9eeab1ec476ace05adcb194b5b377712e44a6bb95a74ffa35faf77f3
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