[FFmpeg-cvslog] avcodec/mpeg4videodec: Fix GMC with videos of dimension 1
Michael Niedermayer
git at videolan.org
Sun Jul 30 00:35:20 EEST 2017
ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jun 24 13:45:35 2017 +0200| [a2bde1363c9313d025fb5deed6caead1b0b04b78] | committer: Michael Niedermayer
avcodec/mpeg4videodec: Fix GMC with videos of dimension 1
Fixes: runtime error: shift exponent -1 is negative
Fixes: 2338/clusterfuzz-testcase-minimized-5153426541379584
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 4976a3411f71518d17a57e373b62517f066648fd)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a2bde1363c9313d025fb5deed6caead1b0b04b78
---
libavcodec/mpeg4videodec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index b057466f19..5dfd2954f7 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -171,7 +171,7 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
int a = 2 << s->sprite_warping_accuracy;
int rho = 3 - s->sprite_warping_accuracy;
int r = 16 / a;
- int alpha = 0;
+ int alpha = 1;
int beta = 0;
int w = s->width;
int h = s->height;
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