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avformat/wtvdec: Check len in parse_chunks() to avoid overflow

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Fixes: signed integer overflow: 2147483647 + 7 cannot be represented in type 'int'
Fixes: 30084/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-6192261941559296

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5552ceaf568915e668679f9581e07eb5507cafc4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-08 14:29:01 +01:00
parent 201eb0c994
commit 6ada27fe95
1 changed files with 1 additions and 1 deletions
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2
libavformat/wtvdec.c
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@ -795,7 +795,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
ff_get_guid(pb, &g);
len = avio_rl32(pb);
if (len < 32) {
if (len < 32 || len > INT_MAX - 7) {
int ret;
if (avio_feof(pb))
return AVERROR_EOF;