[router] fix assert when encoding metadata #13511
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Signed-off-by: Asra Ali <asraa@google.com>
alyssawilk
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Oct 13, 2020
mpuncel
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* master: (22 commits) http: using CONNECT_ERROR for HTTP/2 (envoyproxy#13519) listener: respect address.pipe.mode (it didn't work) (envoyproxy#13493) examples: Fix more deprecations/warnings in configs (envoyproxy#13529) overload: tcp connection refusal overload action (envoyproxy#13311) tcp: towards pluggable upstreams (envoyproxy#13331) conn_pool: fixing comments (envoyproxy#13520) Prevent SEGFAULT when disabling listener (envoyproxy#13515) Convert overload manager config literals to YAML (envoyproxy#13518) Fix runtime feature variable name (envoyproxy#13533) dependencies: refactor repository location schema utils, cleanups. (envoyproxy#13452) router: fix an invalid ASSERT when encoding metadata frames in the router. (envoyproxy#13511) http2: Proactively disconnect connections flooded when resetting stream (envoyproxy#13482) ci use azp to sync filter example (envoyproxy#13501) mongo_proxy: support configurable command list for metrics (envoyproxy#13494) http local rate limit: note token bucket is shared (envoyproxy#13525) wasm/extensions: Wasm extension policy. (envoyproxy#13526) http: removing envoy.reloadable_features.http1_flood_protection (envoyproxy#13508) build: update ppc64le CI build status shield (envoyproxy#13521) dependencies: enforce dependency shepherd sign-off via RepoKitteh. (envoyproxy#13522) Add no_traffic_healthy_interval (envoyproxy#13336) ... Signed-off-by: Michael Puncel <mpuncel@squareup.com>
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Signed-off-by: Asra Ali asraa@google.com
Commit Message: Fix an invalid ASSERT when encoding metadata frames in the router.
Additional Description:
METADATA frames can't end stream, so there must be data, trailers, or a reset stream frame to end the stream. The ASSERT was meant to verify that there is data following METADATA frames to end the stream (for example, in case a client sends headers only request and metadata is added, FM adds empty data to end the stream). However, trailers could also end the stream, or the client could send body later/never. The ASSERT is invalid.
The PR removes the ASSERT.
Open to suggestions to have an ASSERT, but I couldn't think of one that was worth it / could be detected here. "if we had a header only request before, ASSERT there is empty data", or "if there is no possibility of stream reset occurring at this stage, ASSERT there is data or trailers."
Risk Level: Low. This only affects the ASSERT, has no impact on traffic.
Testing: Integration test added as a regression. Fuzz testcase added.
Fixes:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26238