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avcodec/svq3: Increase offsets to prevent integer overflows 

Fixes: 1280/clusterfuzz-testcase-minimized-6102353767825408

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 2017-04-27 15:10:25 +02:00
parent a75ef1506a
commit 382b4fc9b5
1 changed files with 6 additions and 6 deletions
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12
libavcodec/svq3.c
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@ -562,8 +562,8 @@ static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,
int fx, fy;
mx = (mx + 1 >> 1) + dx;
my = (my + 1 >> 1) + dy;
fx = (unsigned)(mx + 0x3000) / 3 - 0x1000;
fy = (unsigned)(my + 0x3000) / 3 - 0x1000;
fx = (unsigned)(mx + 0x30000) / 3 - 0x10000;
fy = (unsigned)(my + 0x30000) / 3 - 0x10000;
dxy = (mx - 3 * fx) + 4 * (my - 3 * fy);
svq3_mc_dir_part(s, x, y, part_width, part_height,
@ -571,8 +571,8 @@ static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,
mx += mx;
my += my;
} else if (mode == HALFPEL_MODE || mode == PREDICT_MODE) {
mx = (unsigned)(mx + 1 + 0x3000) / 3 + dx - 0x1000;
my = (unsigned)(my + 1 + 0x3000) / 3 + dy - 0x1000;
mx = (unsigned)(mx + 1 + 0x30000) / 3 + dx - 0x10000;
my = (unsigned)(my + 1 + 0x30000) / 3 + dy - 0x10000;
dxy = (mx & 1) + 2 * (my & 1);
svq3_mc_dir_part(s, x, y, part_width, part_height,
@ -580,8 +580,8 @@ static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,
mx *= 3;
my *= 3;
} else {
mx = (unsigned)(mx + 3 + 0x6000) / 6 + dx - 0x1000;
my = (unsigned)(my + 3 + 0x6000) / 6 + dy - 0x1000;
mx = (unsigned)(mx + 3 + 0x60000) / 6 + dx - 0x10000;
my = (unsigned)(my + 3 + 0x60000) / 6 + dy - 0x10000;
svq3_mc_dir_part(s, x, y, part_width, part_height,
mx, my, 0, 0, dir, avg);