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http2: handle on_begin_headers() called more than once

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This triggered an assert if called more than once in debug mode (and a
memory leak if not debug build). With the right sequence of HTTP/2
headers incoming it can happen.

Detected by OSS-Fuzz

Closes #2507
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7764
This commit is contained in:
Daniel Stenberg 2018-04-18 23:51:01 +02:00
parent 8996300211
commit 6d3c9c8ab4
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 4 additions and 8 deletions
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12
lib/http2.c
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@ -870,16 +870,12 @@ static int on_begin_headers(nghttp2_session *session,
return 0;
}
/* This is trailer HEADERS started. Allocate buffer for them. */
H2BUGF(infof(data_s, "trailer field started\n"));
DEBUGASSERT(stream->trailer_recvbuf == NULL);
stream->trailer_recvbuf = Curl_add_buffer_init();
if(!stream->trailer_recvbuf) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
stream->trailer_recvbuf = Curl_add_buffer_init();
if(!stream->trailer_recvbuf) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
}
return 0;
}