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avformat/asfdec_f: Check for negative ext_len 

Fixes: Infinite loop
Fixes: 26376/clusterfuzz-testcase-minimized-ffmpeg_dem_PCM_U32LE_fuzzer-6050518830678016
Fixes: 26377/clusterfuzz-testcase-minimized-ffmpeg_dem_TY_fuzzer-4838195726123008
Fixes: 26384/clusterfuzz-testcase-minimized-ffmpeg_dem_G729_fuzzer-5173450337157120
Fixes: 26396/clusterfuzz-testcase-minimized-ffmpeg_dem_PCM_S24BE_fuzzer-5071092206796800

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-16 11:13:19 +02:00
parent 50b29f081e
commit 209b9ff5c3
1 changed files with 2 additions and 0 deletions
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2
libavformat/asfdec_f.c
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@ -607,6 +607,8 @@ static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
ff_get_guid(pb, &g);
size = avio_rl16(pb);
ext_len = avio_rl32(pb);
if (ext_len < 0)
return AVERROR_INVALIDDATA;
avio_skip(pb, ext_len);
if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
ASFPayload *p = &asf->streams[stream_num].payload[i];