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xxan: don't read before start of buffer in av_memcpy_backptr().

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit f1279e286b00e99f343adb51e251f036a3df6f32)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Ronald S. Bultje 2012-03-08 16:32:46 -08:00 committed by Reinhard Tartler
parent 311361348d
commit 5ae49ddaa4
1 changed files with 2 additions and 1 deletions
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3
libavcodec/xxan.c
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@ -129,7 +129,8 @@ static int xan_unpack(uint8_t *dest, const int dest_len,
if (size + size2 > dest_end - dest)
break;
}
if (src + size > src_end || dest + size + size2 > dest_end)
if (src + size > src_end || dest + size + size2 > dest_end ||
dest - orig_dest + size < back)
return -1;
bytestream_get_buffer(&src, dest, size);
dest += size;