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xan: Check for out of bound reads in xan_huffman_decode()

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Signed-off-by: Janne Grunau <janne-libav@jannau.net>
This commit is contained in:
Laurent Aimar 2011-09-29 20:38:01 +00:00 committed by Janne Grunau
parent 3e0757c2a8
commit 3db3fdf4c6
1 changed files with 4 additions and 1 deletions
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5
libavcodec/xan.c
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@ -112,7 +112,10 @@ static int xan_huffman_decode(unsigned char *dest, int dest_len,
init_get_bits(&gb, ptr, ptr_len * 8);
while ( val != 0x16 ) {
val = src[val - 0x17 + get_bits1(&gb) * byte];
unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
if (idx >= 2 * byte)
return -1;
val = src[idx];
if ( val < 0x16 ) {
if (dest >= dest_end)