[FFmpeg-cvslog] avformat/thp: Check compcount
Michael Niedermayer
git at videolan.org
Tue Jul 7 21:40:32 EEST 2020
ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun May 31 14:24:04 2020 +0200| [a77a20ddeee211ed84b660dc0e3be6ccdfd68719] | committer: Michael Niedermayer
avformat/thp: Check compcount
Fixes: out of array access
Fixes: 22520/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5100297658826752
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 1ba8484559661dfdbca36dbc17b203f33f62e26c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a77a20ddeee211ed84b660dc0e3be6ccdfd68719
---
libavformat/thp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/thp.c b/libavformat/thp.c
index f2cac5b3fb..2e27f1da18 100644
--- a/libavformat/thp.c
+++ b/libavformat/thp.c
@@ -93,6 +93,9 @@ static int thp_read_header(AVFormatContext *s)
avio_seek (pb, thp->compoff, SEEK_SET);
thp->compcount = avio_rb32(pb);
+ if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
+ return AVERROR_INVALIDDATA;
+
/* Read the list of component types. */
avio_read(pb, thp->components, 16);
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