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avformat/mov: sanity check STSD entries 

The choosen value is arbitrary. I am not sure if this is a good idea
but i dont immedeately see an alternative better way, it seems either
an arbitrary limit or OOM

Fixes: OOM
Fixes: 27492/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6194970578649088

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 2021-02-06 21:54:31 +01:00
parent 505d6ed475
commit cb90e1c4d0
1 changed files with 1 additions and 1 deletions
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2
libavformat/mov.c
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@ -2605,7 +2605,7 @@ static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
entries = avio_rb32(pb);
/* Each entry contains a size (4 bytes) and format (4 bytes). */
if (entries <= 0 || entries > atom.size / 8) {
if (entries <= 0 || entries > atom.size / 8 || entries > 1024) {
av_log(c->fc, AV_LOG_ERROR, "invalid STSD entries %d\n", entries);
return AVERROR_INVALIDDATA;
}