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| author | Jesper Nilsson <jesper.nilsson@axis.com> | 2009-03-27 10:17:45 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-27 10:17:45 +0300 |
| commit | 71f6f6dfdf7c7a67462386d9ea05c1095a89c555 (patch) | |
| tree | 9c8064b98f5432a04d922a9911ce46d340d2c26b /net/ipv6/ip6_input.c | |
| parent | a1702857724fb39cb68ce581490010df99168fd0 (diff) | |
| download | linux-71f6f6dfdf7c7a67462386d9ea05c1095a89c555.tar.xz | |
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.c | 4 |
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; } |