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avformat/mov: Check comp_brand_size 

Fixes: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'
Fixes: 24457/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5760093644390400

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 2020-08-02 00:51:12 +02:00
parent fd0064f75b
commit ffa6072fc7
1 changed files with 1 additions and 1 deletions
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2
libavformat/mov.c
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@ -1108,7 +1108,7 @@ static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
av_dict_set_int(&c->fc->metadata, "minor_version", minor_ver, 0);
comp_brand_size = atom.size - 8;
if (comp_brand_size < 0)
if (comp_brand_size < 0 || comp_brand_size == INT_MAX)
return AVERROR_INVALIDDATA;
comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
if (!comp_brands_str)