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Code Issues Releases Activity

avcodec/dirac_dwt_template: Fix Integer overflow in horizontal_compose_dd137i()

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Fixes: 5894/clusterfuzz-testcase-minimized-5315325420634112
Fixes: runtime error: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'

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 647fa49495)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-17 21:47:09 +01:00
parent 010dd0d26e
commit 6492799fce
1 changed files with 4 additions and 4 deletions
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8
libavcodec/dirac_dwt_template.c
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@ -95,8 +95,8 @@ static void RENAME(horizontal_compose_dd97i)(uint8_t *_b, uint8_t *_tmp, int w)
tmp[w2+1] = tmp[w2] = tmp[w2-1];
for (x = 0; x < w2; x++) {
b[2*x ] = (tmp[x] + 1)>>1;
b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
b[2*x ] = ((int)(tmp[x] + 1U))>>1;
b[2*x+1] = ((int)(COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1U))>>1;
}
}
@ -118,8 +118,8 @@ static void RENAME(horizontal_compose_dd137i)(uint8_t *_b, uint8_t *_tmp, int w)
tmp[w2+1] = tmp[w2] = tmp[w2-1];
for (x = 0; x < w2; x++) {
b[2*x ] = (tmp[x] + 1)>>1;
b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
b[2*x ] = ((int)(tmp[x] + 1U))>>1;
b[2*x+1] = ((int)(COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1U))>>1;
}
}