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avformat/mov: Check for EOF in mov_read_glbl() 

Fixes: Infinite loop
Fixes: 41351/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5433895854669824

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 2021-12-04 20:11:35 +01:00
parent b0b90100bf
commit 59b4e7cbd8
1 changed files with 2 additions and 0 deletions
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2
libavformat/mov.c
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@ -1930,6 +1930,8 @@ static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
// wrap a whole fiel atom inside of a glbl atom.
unsigned size = avio_rb32(pb);
unsigned type = avio_rl32(pb);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
avio_seek(pb, -8, SEEK_CUR);
if (type == MKTAG('f','i','e','l') && size == atom.size)
return mov_read_default(c, pb, atom);