[FFmpeg-cvslog] avformat/imx: Check palette chunk size
Michael Niedermayer
git at videolan.org
Thu Apr 1 11:10:51 EEST 2021
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Mar 30 12:47:22 2021 +0200| [f7a515044766426cf3cac20bdc091b700f00a458] | committer: Michael Niedermayer
avformat/imx: Check palette chunk size
Fixes: out of array write
Fixes: 32116/clusterfuzz-testcase-minimized-ffmpeg_dem_SIMBIOSIS_IMX_fuzzer-6702533894602752
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=f7a515044766426cf3cac20bdc091b700f00a458
---
libavformat/imx.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavformat/imx.c b/libavformat/imx.c
index d203ed7a28..22fca0bdc0 100644
--- a/libavformat/imx.c
+++ b/libavformat/imx.c
@@ -113,6 +113,8 @@ retry:
imx->first_video_packet_pos = pos;
break;
case 0xAA98:
+ if (chunk_size > 256 * 3)
+ return AVERROR_INVALIDDATA;
for (int i = 0; i < chunk_size / 3; i++) {
unsigned r = avio_r8(pb) << 18;
unsigned g = avio_r8(pb) << 10;
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