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authorJing Min Zhao <zhaojingmin@vivecode.com>2007-07-05 20:42:14 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-06 21:47:05 -0700
commitfcc56368e2c29ef4fb91d9374cea4834d0a6eb61 (patch)
tree039e4d35f3106c23a8f8dae2c75d2cebda228362
parentf4f835e151bc00961ef65449a992817931355793 (diff)
nf_conntrack_h323: add checking of out-of-range on choices' index values
[NETFILTER]: nf_conntrack_h323: add checking of out-of-range on choices' index values Choices' index values may be out of range while still encoded in the fixed length bit-field. This bug may cause access to undefined types (NULL pointers) and thus crashes (Reported by Zhongling Wen). This patch also adds checking of decode flag when decoding SEQUENCEs. Signed-off-by: Jing Min Zhao <zhaojingmin@vivecode.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/netfilter/nf_conntrack_h323_asn1.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index f6fad713d484..6b7eaa019d4c 100644
--- a/net/netfilter/nf_conntrack_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -518,7 +518,7 @@ int decode_seq(bitstr_t * bs, field_t * f, char *base, int level)
CHECK_BOUND(bs, 2);
len = get_len(bs);
CHECK_BOUND(bs, len);
- if (!base) {
+ if (!base || !(son->attr & DECODE)) {
PRINT("%*.s%s\n", (level + 1) * TAB_SIZE,
" ", son->name);
bs->cur += len;
@@ -704,6 +704,8 @@ int decode_choice(bitstr_t * bs, field_t * f, char *base, int level)
} else {
ext = 0;
type = get_bits(bs, f->sz);
+ if (type >= f->lb)
+ return H323_ERROR_RANGE;
}
/* Write Type */