[FFmpeg-cvslog] avcodec/cavsdec: Check alpha/beta offset
Michael Niedermayer
git at videolan.org
Tue Feb 27 23:00:39 EET 2018
ffmpeg | branch: release/3.0 | Michael Niedermayer <michael at niedermayer.cc> | Tue Feb 20 23:11:01 2018 +0100| [24a3c45da511c58f550f33db507c3fda50e496af] | committer: Michael Niedermayer
avcodec/cavsdec: Check alpha/beta offset
Fixes: Integer overflow
Fixes: 6183/clusterfuzz-testcase-minimized-6269224436629504
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 ae2eb04648839bfc6c61c32cb0f124e91bb7ff8e)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=24a3c45da511c58f550f33db507c3fda50e496af
---
libavcodec/cavsdec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/cavsdec.c b/libavcodec/cavsdec.c
index cd4eec9caf..b7aeb45603 100644
--- a/libavcodec/cavsdec.c
+++ b/libavcodec/cavsdec.c
@@ -1067,6 +1067,11 @@ static int decode_pic(AVSContext *h)
if (!h->loop_filter_disable && get_bits1(&h->gb)) {
h->alpha_offset = get_se_golomb(&h->gb);
h->beta_offset = get_se_golomb(&h->gb);
+ if ( h->alpha_offset < -64 || h->alpha_offset > 64
+ || h-> beta_offset < -64 || h-> beta_offset > 64) {
+ h->alpha_offset = h->beta_offset = 0;
+ return AVERROR_INVALIDDATA;
+ }
} else {
h->alpha_offset = h->beta_offset = 0;
}
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