[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 7/9] Decompressors: validate match distance in unlzma.c
From: Lasse Collin <lasse.collin@xxxxxxxxxxx> 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@xxxxxxxxxxx> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- a/xen/common/unlzma.c +++ b/xen/common/unlzma.c @@ -516,6 +516,9 @@ static inline int INIT process_bit1(stru 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; Attachment:
unlzma-validate-match-distance.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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