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authorNicolas Dichtel <nicolas.dichtel@dev.6wind.com>2010-03-25 23:45:35 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-27 08:33:21 -0700
commit7438189baa0a2fe30084bdc97e3d540ebc5444f3 (patch)
tree6627b63b785df9175e04a0ce1b49d5eea8ea0777 /net/ipv6
parente7d481a6f3c13041446b7bb8f98ab861460076a3 (diff)
downloadlinux-2.6.34-ux500-7438189baa0a2fe30084bdc97e3d540ebc5444f3.tar.gz
net: ipmr/ip6mr: prevent out-of-bounds vif_table access
When cache is unresolved, c->mf[6]c_parent is set to 65535 and minvif, maxvif are not initialized, hence we must avoid to parse IIF and OIF. A second problem can happen when the user dumps a cache entry where a VIF, that was referenced at creation time, has been removed. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6mr.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 23e4ac0cc30..27acfb58650 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1695,17 +1695,20 @@ ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm)
int ct;
struct rtnexthop *nhp;
struct net *net = mfc6_net(c);
- struct net_device *dev = net->ipv6.vif6_table[c->mf6c_parent].dev;
u8 *b = skb_tail_pointer(skb);
struct rtattr *mp_head;
- if (dev)
- RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex);
+ /* If cache is unresolved, don't try to parse IIF and OIF */
+ if (c->mf6c_parent > MAXMIFS)
+ return -ENOENT;
+
+ if (MIF_EXISTS(net, c->mf6c_parent))
+ RTA_PUT(skb, RTA_IIF, 4, &net->ipv6.vif6_table[c->mf6c_parent].dev->ifindex);
mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
- if (c->mfc_un.res.ttls[ct] < 255) {
+ if (MIF_EXISTS(net, ct) && c->mfc_un.res.ttls[ct] < 255) {
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
goto rtattr_failure;
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));