[FFmpeg-cvslog] avformat/bintext: Check width in idf_read_header()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Oct 31 13:51:47 2020 +0100| [442d53f409c8d84c7db120227caac00af54aa884] | committer: Michael Niedermayer

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 at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=442d53f409c8d84c7db120227caac00af54aa884
---

 libavformat/bintext.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/bintext.c b/libavformat/bintext.c
index 7dab5f377d..144b4172af 100644
--- a/libavformat/bintext.c
+++ b/libavformat/bintext.c
@@ -344,6 +344,8 @@ 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);