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avcodec/mpeg4video: Fix runtime error: left shift of negative value

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Fixes: 644/clusterfuzz-testcase-4726434209726464
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 2017-02-22 01:22:24 +01:00
parent 92188c8f57
commit 6179dc8aa7
2 changed files with 5 additions and 5 deletions
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2
libavcodec/mpeg4videodec.c
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@ -510,7 +510,7 @@ static inline int get_amv(Mpeg4DecContext *ctx, int n)
if (ctx->divx_version == 500 && ctx->divx_build == 413)
sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
else
sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
} else {
dx = s->sprite_delta[n][0];
dy = s->sprite_delta[n][1];

8
libavcodec/mpegvideo_motion.c
View File

@ -48,8 +48,8 @@ static void gmc1_motion(MpegEncContext *s,
motion_y = s->sprite_offset[0][1];
src_x = s->mb_x * 16 + (motion_x >> (s->sprite_warping_accuracy + 1));
src_y = s->mb_y * 16 + (motion_y >> (s->sprite_warping_accuracy + 1));
motion_x <<= (3 - s->sprite_warping_accuracy);
motion_y <<= (3 - s->sprite_warping_accuracy);
motion_x *= 1 << (3 - s->sprite_warping_accuracy);
motion_y *= 1 << (3 - s->sprite_warping_accuracy);
src_x = av_clip(src_x, -16, s->width);
if (src_x == s->width)
motion_x = 0;
@ -95,8 +95,8 @@ static void gmc1_motion(MpegEncContext *s,
motion_y = s->sprite_offset[1][1];
src_x = s->mb_x * 8 + (motion_x >> (s->sprite_warping_accuracy + 1));
src_y = s->mb_y * 8 + (motion_y >> (s->sprite_warping_accuracy + 1));
motion_x <<= (3 - s->sprite_warping_accuracy);
motion_y <<= (3 - s->sprite_warping_accuracy);
motion_x *= 1 << (3 - s->sprite_warping_accuracy);
motion_y *= 1 << (3 - s->sprite_warping_accuracy);
src_x = av_clip(src_x, -8, s->width >> 1);
if (src_x == s->width >> 1)
motion_x = 0;