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validate input data and linesizes

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Originally committed as revision 31976 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla 2010-08-18 19:37:37 +00:00
parent 18bbe9df9a
commit a42c29febc
1 changed files with 24 additions and 0 deletions
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24
libswscale/swscale.c
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@ -1827,6 +1827,21 @@ static void reset_ptr(const uint8_t* src[], int format)
}
}
static int check_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt,
const int linesizes[4])
{
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
int i;
for (i = 0; i < 4; i++) {
int plane = desc->comp[i].plane;
if (!data[plane] || !linesizes[plane])
return 0;
}
return 1;
}
/**
* swscale wrapper, so we don't need to export the SwsContext.
* Assumes planar YUV to be in YUV order instead of YVU.
@ -1842,6 +1857,15 @@ int sws_scale(SwsContext *c, const uint8_t* const src[], const int srcStride[],
if (srcSliceH == 0)
return 0;
if (!check_image_pointers(src, c->srcFormat, srcStride)) {
av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
return 0;
}
if (!check_image_pointers(dst, c->dstFormat, dstStride)) {
av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
return 0;
}
if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
return 0;