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Decompressors: validate match distance in decompress_unlzma.c

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Validate the newly decoded distance (rep0) in process_bit1().  This is to
detect corrupt LZMA data quickly.  The old code can run for long time
producing garbage until it hits the end of the input.

Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lasse Collin 2011-01-12 17:01:19 -08:00 committed by Linus Torvalds
parent 528941ca05
commit eb0cf3e19b
1 changed files with 3 additions and 0 deletions
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lib/decompress_unlzma.c
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@ -522,6 +522,9 @@ static inline int INIT process_bit1(struct writer *wr, struct rc *rc,
cst->rep0 = pos_slot;
if (++(cst->rep0) == 0)
return 0;
if (cst->rep0 > wr->header->dict_size
|| cst->rep0 > get_pos(wr))
return -1;
}
len += LZMA_MATCH_MIN_LEN;