swscale: enforce a minimum filtersize.
authorRonald S. Bultje <rsbultje@gmail.com>
Sat, 11 Feb 2012 16:42:28 +0000 (08:42 -0800)
committerRonald S. Bultje <rsbultje@gmail.com>
Sat, 11 Feb 2012 18:06:50 +0000 (10:06 -0800)
commitdae2ce361a2b5fd9be1d43e5e8c00bdbc5f03e3d
tree79129d6d2205b244c136adad4923d176cd758a38
parent764852d6531016491a19d73d31e619887890f04d
swscale: enforce a minimum filtersize.

At very small dimensions, this calculation could lead to zero-sized
filters, which leads to uninitialized output, zero-sized allocations,
loop overflows in SIMD that uses do{..}while(i++<filtersize); instead
of for(i=0;i<filtersize;i++){..} and several other similar failures.
Therefore, require a minimum filtersize of 1.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
libswscale/utils.c