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avformat/bintext: Check width in idf_read_header() 

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 442d53f409)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-31 13:51:47 +01:00
parent 143037c580
commit a56fdfc01f
1 changed files with 2 additions and 0 deletions
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2
libavformat/bintext.c
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@ -342,6 +342,8 @@ static int idf_read_header(AVFormatContext *s)
bin->fsize = avio_size(pb) - 12 - 4096 - 48;
ff_sauce_read(s, &bin->fsize, &got_width, 0);
if (st->codecpar->width < 8)
return AVERROR_INVALIDDATA;
if (!bin->width)
calculate_height(st->codecpar, bin->fsize);
avio_seek(pb, 12, SEEK_SET);