From: Mengye Lv <mengy...@tencent.com>
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
Signed-off-by: Mengye Lv <mengy...@tencent.com>
Signed-off-by: Jun Zhao <barryjz...@tencent.com>
---
libavutil/common.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/libavutil/common.h b/libavutil/common.h
index af35397..f09f0b4 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))
--
1.7.1
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
