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avcodec/mpeg4videodec: Fix runtime error: left shift of negative value -2650

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Fixes: 674/clusterfuzz-testcase-6713275880308736

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-26 20:27:59 +01:00
parent 4ea7744859
commit 25e93aacc2
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mpeg4videodec.c
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@ -283,12 +283,12 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
ctx->sprite_shift[1] = 0;
break;
case 2:
s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
s->sprite_offset[0][0] = (sprite_ref[0][0] * (1 << alpha + rho)) +
(-r * sprite_ref[0][0] + virtual_ref[0][0]) *
(-vop_ref[0][0]) +
(r * sprite_ref[0][1] - virtual_ref[0][1]) *
(-vop_ref[0][1]) + (1 << (alpha + rho - 1));
s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << alpha + rho)) +
(-r * sprite_ref[0][1] + virtual_ref[0][1]) *
(-vop_ref[0][0]) +
(-r * sprite_ref[0][0] + virtual_ref[0][0]) *