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avformat/wavdec: More complete size check in find_guid()

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Fixes: signed integer overflow: 9223372036854775807 + 8 cannot be represented in type 'long'
Fixes: 27341/clusterfuzz-testcase-minimized-ffmpeg_dem_W64_fuzzer-5442833206738944

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 2020-11-14 22:13:52 +01:00
parent 2eb6417417
commit a207df2acb
1 changed files with 1 additions and 1 deletions
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libavformat/wavdec.c
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@ -666,7 +666,7 @@ static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
while (!avio_feof(pb)) {
avio_read(pb, guid, 16);
size = avio_rl64(pb);
if (size <= 24)
if (size <= 24 || size > INT64_MAX - 8)
return AVERROR_INVALIDDATA;
if (!memcmp(guid, guid1, 16))
return size;