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avutil/common: Fix integer overflow in av_clip_uint8_c() and av_clip_uint16_c()

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Fixes: 5567/clusterfuzz-testcase-minimized-5769966247739392
Fixes: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself

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 ab6f571ef7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-14 03:54:13 +01:00
parent 878fc42a90
commit 519d48c861
1 changed files with 2 additions and 2 deletions
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4
libavutil/common.h
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@ -158,7 +158,7 @@ static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, in
*/
static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
{
if (a&(~0xFF)) return (-a)>>31;
if (a&(~0xFF)) return (~a)>>31;
else return a;
}
@ -180,7 +180,7 @@ static av_always_inline av_const int8_t av_clip_int8_c(int a)
*/
static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
{
if (a&(~0xFFFF)) return (-a)>>31;
if (a&(~0xFFFF)) return (~a)>>31;
else return a;
}