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Code Issues Releases Activity

avcodec/pngdec: fix signed overflow

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fixes fate ftrapv failure

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2013-12-18 22:15:32 +01:00
parent 03a5c44fae
commit cb079b1b2b
1 changed files with 1 additions and 1 deletions
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libavcodec/pngdec.c
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@@ -226,7 +226,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
if (bpp == 4) {
p = *(int*)dst;
for (; i < size; i += bpp) {
int s = *(int*)(src + i);
unsigned s = *(int*)(src + i);
p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
*(int*)(dst + i) = p;
}