From ceeff7541e5a4ba8e8d97ffbae32b3f283cb7a3f Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 11 Jun 2008 17:51:10 -0700 Subject: [PATCH] netfilter: nf_conntrack: fix ctnetlink related crash in nf_nat_setup_info() When creation of a new conntrack entry in ctnetlink fails after having set up the NAT mappings, the conntrack has an extension area allocated that is not getting properly destroyed when freeing the conntrack again. This means the NAT extension is still in the bysource hash, causing a crash when walking over the hash chain the next time: BUG: unable to handle kernel paging request at 00120fbd IP: [] nf_nat_setup_info+0x221/0x58a *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP Pid: 2795, comm: conntrackd Not tainted (2.6.26-rc5 #1) EIP: 0060:[] EFLAGS: 00010206 CPU: 1 EIP is at nf_nat_setup_info+0x221/0x58a EAX: 00120fbd EBX: 00120fbd ECX: 00000001 EDX: 00000000 ESI: 0000019e EDI: e853bbb4 EBP: e853bbc8 ESP: e853bb78 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process conntrackd (pid: 2795, ti=e853a000 task=f7de10f0 task.ti=e853a000) Stack: 00000000 e853bc2c e85672ec 00000008 c0561084 63c1db4a 00000000 00000000 00000000 0002e109 61d2b1c3 00000000 00000000 00000000 01114e22 61d2b1c3 00000000 00000000 f7444674 e853bc04 00000008 c038e728 0000000a f7444674 Call Trace: [] nla_parse+0x5c/0xb0 [] ctnetlink_change_status+0x190/0x1c6 [] ctnetlink_new_conntrack+0x189/0x61f [] update_curr+0x3d/0x52 [] nfnetlink_rcv_msg+0xc1/0xd8 [] nfnetlink_rcv_msg+0x18/0xd8 [] nfnetlink_rcv_msg+0x0/0xd8 [] netlink_rcv_skb+0x2d/0x71 [] nfnetlink_rcv+0x19/0x24 [] netlink_unicast+0x1b3/0x216 ... Move invocation of the extension destructors to nf_conntrack_free() to fix this problem. Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10875 Reported-and-Tested-by: Krzysztof Piotr Oledzki Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/nf_conntrack_core.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index c4b1799da5d7..662c1ccfee26 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -196,8 +196,6 @@ destroy_conntrack(struct nf_conntrack *nfct) if (l4proto && l4proto->destroy) l4proto->destroy(ct); - nf_ct_ext_destroy(ct); - rcu_read_unlock(); spin_lock_bh(&nf_conntrack_lock); @@ -520,6 +518,7 @@ static void nf_conntrack_free_rcu(struct rcu_head *head) void nf_conntrack_free(struct nf_conn *ct) { + nf_ct_ext_destroy(ct); call_rcu(&ct->rcu, nf_conntrack_free_rcu); } EXPORT_SYMBOL_GPL(nf_conntrack_free); -- 2.34.1