Verify that secp256k1_ge_set_gej_zinv does not operate on infinity.

a->x and a->y should not be used if the infinity flag is set.
BlockstreamResearch · Dec 3, 2021 · 6c0be85 · 6c0be85
1 parent fecf436
commit 6c0be85
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/group_impl.h b/src/group_impl.h
@@ -67,6 +67,7 @@ static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(0, 0, 0, 0,
 static void secp256k1_ge_set_gej_zinv(secp256k1_ge *r, const secp256k1_gej *a, const secp256k1_fe *zi) {
     secp256k1_fe zi2;
     secp256k1_fe zi3;
+    VERIFY_CHECK(!a->infinity);
     secp256k1_fe_sqr(&zi2, zi);
     secp256k1_fe_mul(&zi3, &zi2, zi);
     secp256k1_fe_mul(&r->x, &a->x, &zi2);