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authorJesper Nilsson <jesper.nilsson@axis.com>2009-03-27 00:17:45 -0700
committerDavid S. Miller <davem@davemloft.net>2009-03-27 00:17:45 -0700
commit71f6f6dfdf7c7a67462386d9ea05c1095a89c555 (patch)
tree9c8064b98f5432a04d922a9911ce46d340d2c26b /net/ipv6/ip6_input.c
parenta1702857724fb39cb68ce581490010df99168fd0 (diff)
downloadlinux-stericsson-71f6f6dfdf7c7a67462386d9ea05c1095a89c555.tar.gz
ipv6: Plug sk_buff leak in ipv6_rcv (net/ipv6/ip6_input.c)
Commit 778d80be52699596bf70e0eb0761cf5e1e46088d (ipv6: Add disable_ipv6 sysctl to disable IPv6 operaion on specific interface) seems to have introduced a leak of sk_buff's for ipv6 traffic, at least in some configurations where idev is NULL, or when ipv6 is disabled via sysctl. The problem is that if the first condition of the if-statement returns non-NULL, it returns an skb with only one reference, and when the other conditions apply, execution jumps to the "out" label, which does not call kfree_skb for it. To plug this leak, change to use the "drop" label instead. (this relies on it being ok to call kfree_skb on NULL) This also allows us to avoid calling rcu_read_unlock here, and removes the only user of the "out" label. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_input.c')
-rw-r--r--net/ipv6/ip6_input.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index f171e8dbac91..8f04bd9da274 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -75,8 +75,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
!idev || unlikely(idev->cnf.disable_ipv6)) {
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
- rcu_read_unlock();
- goto out;
+ goto drop;
}
memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
@@ -147,7 +146,6 @@ err:
drop:
rcu_read_unlock();
kfree_skb(skb);
-out:
return 0;
}