xxan: don't read before start of buffer in av_memcpy_backptr().
authorRonald S. Bultje <rsbultje@gmail.com>
Fri, 9 Mar 2012 00:32:46 +0000 (16:32 -0800)
committerRonald S. Bultje <rsbultje@gmail.com>
Sat, 10 Mar 2012 19:48:39 +0000 (11:48 -0800)
commitf1279e286b00e99f343adb51e251f036a3df6f32
tree2397455f2308fbf4b34b46cce14f6b8c470e5c89
parenta928ed375108caf1dc8a0a2a6f42e5f17665e74a
xxan: don't read before start of buffer in av_memcpy_backptr().

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