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authorPatrick McHardy <kaber@trash.net>2010-03-17 06:04:14 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-19 22:47:22 -0700
commita50436f2cd6e85794f7e1aad795ca8302177b896 (patch)
tree522ac0b3ac330fb53d4ee9147f7565b27b482085 /net/ipv6
parentea93fd9456ad32cd85b2d7914b58c6313cc40c9e (diff)
downloadlinux-a50436f2cd6e85794f7e1aad795ca8302177b896.tar.bz2
net: ipmr/ip6mr: fix potential out-of-bounds vif_table access
mfc_parent of cache entries is used to index into the vif_table and is initialised from mfcctl->mfcc_parent. This can take values of to 2^16-1, while the vif_table has only MAXVIFS (32) entries. The same problem affects ip6mr. Refuse invalid values to fix a potential out-of-bounds access. Unlike the other validity checks, this is checked in ipmr_mfc_add() instead of the setsockopt handler since its unused in the delete path and might be uninitialized. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6mr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 52e0f74fdfe0..23e4ac0cc30e 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1113,6 +1113,9 @@ static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock)
unsigned char ttls[MAXMIFS];
int i;
+ if (mfc->mf6cc_parent >= MAXMIFS)
+ return -ENFILE;
+
memset(ttls, 255, MAXMIFS);
for (i = 0; i < MAXMIFS; i++) {
if (IF_ISSET(i, &mfc->mf6cc_ifset))