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avformat/bintext: Check width in idf_read_header()

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Fixes: division by 0
Fixes: 26802/clusterfuzz-testcase-minimized-ffmpeg_dem_IDF_fuzzer-5180591554953216.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 442d53f409c8d84c7db120227caac00af54aa884)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-31 13:51:47 +01:00
parent 9d2df3050e
commit c2221da019
1 changed files with 2 additions and 0 deletions
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2
libavformat/bintext.c
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@ -340,6 +340,8 @@ static int idf_read_header(AVFormatContext *s)
bin->fsize = avio_size(pb) - 12 - 4096 - 48; bin->fsize = avio_size(pb) - 12 - 4096 - 48;
ff_sauce_read(s, &bin->fsize, &got_width, 0); ff_sauce_read(s, &bin->fsize, &got_width, 0);
if (st->codecpar->width < 8)
return AVERROR_INVALIDDATA;
if (!bin->width) if (!bin->width)
calculate_height(st->codecpar, bin->fsize); calculate_height(st->codecpar, bin->fsize);
avio_seek(pb, 12, SEEK_SET); avio_seek(pb, 12, SEEK_SET);