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| author | Mengye Lv <mengyelv@tencent.com> | 2019-10-02 10:30:45 +0800 |
|---|---|---|
| committer | Jun Zhao <barryjzhao@tencent.com> | 2019-10-06 17:28:29 +0800 |
| commit | 9f353e376b161eb16a78fd7ad727c9513ac60d13 (patch) | |
| tree | 85e244d587f62b95cfeb2c1265bd9f231fd9320d /libavutil/common.h | |
| parent | 3b4e9a31ea263830d6dfbc402c02e3c8d017094f (diff) | |
| download | ffmpeg-9f353e376b161eb16a78fd7ad727c9513ac60d13.tar.gz | |
avutil/common: Fix underflow for ROUNDED_DIV with unsigned integer
When used ROUNDED_DIV(a,b), if a is unsigned integer zero, it's
will lead to an underflow issue(it called unsigned integer
wrapping).
Fixes #8062
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Mengye Lv <mengyelv@tencent.com>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
Diffstat (limited to 'libavutil/common.h')
| -rw-r--r-- | libavutil/common.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavutil/common.h b/libavutil/common.h index af35397eb9..f09f0b486b 100644 --- a/libavutil/common.h +++ b/libavutil/common.h @@ -53,7 +53,7 @@ //rounded division & shift #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) /* assume b>0 */ -#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) +#define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */ #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ : ((a) + (1<<(b)) - 1) >> (b)) |