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avcodec/mpeg4videodec: Fix GMC with videos of dimension 1

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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@niedermayer.cc>
(cherry picked from commit 4976a3411f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-06-24 13:45:35 +02:00
parent a7c0243e2f
commit a2bde1363c
1 changed files with 1 additions and 1 deletions
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libavcodec/mpeg4videodec.c
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@ -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;