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sws: check that dither array is not null before memset 

Fixes null pointer dereference

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-19 22:46:34 +01:00
parent aef5c0b68f
commit 89afa635bf
1 changed files with 1 additions and 1 deletions
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2
libswscale/swscale.c
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@ -910,7 +910,7 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
src2[0] = base;
}
if (!srcSliceY && (c->flags & SWS_BITEXACT) && (c->flags & SWS_ERROR_DIFFUSION))
if (!srcSliceY && (c->flags & SWS_BITEXACT) && (c->flags & SWS_ERROR_DIFFUSION) && c->dither_error[0])
for (i = 0; i < 4; i++)
memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));