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authorDaniel Stenberg <daniel@haxx.se>2018-04-18 23:51:01 +0200
committerDaniel Stenberg <daniel@haxx.se>2018-04-19 08:06:40 +0200
commit6d3c9c8ab4754ea21622d65f11df403bbaf46e2d (patch)
treea829581bb51c47779183e565a6dc03295114c718
parent899630021153b2a26a43008cccc6620b6c3f9bbf (diff)
downloadcurl-6d3c9c8ab4754ea21622d65f11df403bbaf46e2d.tar.gz
http2: handle on_begin_headers() called more than once
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
-rw-r--r--lib/http2.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/lib/http2.c b/lib/http2.c
index 6758f9554..e60ae247b 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -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;
}