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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-02-22 16:47:14 -0800 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-02-23 10:30:07 -0800 |
| commit | 491865b57db5fbb3053c221fd6d94b0435cad105 (patch) | |
| tree | 3b088dce41163f35e1ee54e3bf4268731346de64 /libswscale | |
| parent | 19a65b5be47944c607a9e979edb098924d95f2e4 (diff) | |
| download | ffmpeg-491865b57db5fbb3053c221fd6d94b0435cad105.tar.gz | |
swscale: fix underflows in firstline calculations for extreme resizes.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Diffstat (limited to 'libswscale')
| -rw-r--r-- | libswscale/swscale.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libswscale/swscale.c b/libswscale/swscale.c index b231302216..bd909bf163 100644 --- a/libswscale/swscale.c +++ b/libswscale/swscale.c @@ -407,9 +407,9 @@ static int swScale(SwsContext *c, const uint8_t* src[], (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL, }; - const int firstLumSrcY= vLumFilterPos[dstY]; //First line needed as input - const int firstLumSrcY2= vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)]; - const int firstChrSrcY= vChrFilterPos[chrDstY]; //First line needed as input + const int firstLumSrcY= FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]); //First line needed as input + const int firstLumSrcY2= FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)]); + const int firstChrSrcY= FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]); //First line needed as input // Last line needed as input int lastLumSrcY = FFMIN(c->srcH, firstLumSrcY + vLumFilterSize) - 1; |