This is a note to let you know that I've just added the patch titled
netfilter: nf_log: release skbuff on nlmsg put failure
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-nf_log-release-skbuff-on-nlmsg-put-failure.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b51d3fa364885a2c1e1668f88776c67c95291820 Mon Sep 17 00:00:00 2001
From: Houcheng Lin <houcheng@xxxxxxxxx>
Date: Thu, 23 Oct 2014 10:36:08 +0200
Subject: netfilter: nf_log: release skbuff on nlmsg put failure
From: Houcheng Lin <houcheng@xxxxxxxxx>
commit b51d3fa364885a2c1e1668f88776c67c95291820 upstream.
The kernel should reserve enough room in the skb so that the DONE
message can always be appended. However, in case of e.g. new attribute
erronously not being size-accounted for, __nfulnl_send() will still
try to put next nlmsg into this full skbuf, causing the skb to be stuck
forever and blocking delivery of further messages.
Fix issue by releasing skb immediately after nlmsg_put error and
WARN() so we can track down the cause of such size mismatch.
[ fw@xxxxxxxxx: add tailroom/len info to WARN ]
Signed-off-by: Houcheng Lin <houcheng@xxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/nfnetlink_log.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -346,26 +346,25 @@ nfulnl_alloc_skb(struct net *net, u32 pe
return skb;
}
-static int
+static void
__nfulnl_send(struct nfulnl_instance *inst)
{
- int status = -1;
-
if (inst->qlen > 1) {
struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
NLMSG_DONE,
sizeof(struct nfgenmsg),
0);
- if (!nlh)
+ if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
+ inst->skb->len, skb_tailroom(inst->skb))) {
+ kfree_skb(inst->skb);
goto out;
+ }
}
- status = nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
- MSG_DONTWAIT);
-
+ nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
+ MSG_DONTWAIT);
+out:
inst->qlen = 0;
inst->skb = NULL;
-out:
- return status;
}
static void
Patches currently in stable-queue which might be from houcheng@xxxxxxxxx are
queue-3.17/netfilter-nf_log-account-for-size-of-nlmsg_done-attribute.patch
queue-3.17/netfilter-nf_log-release-skbuff-on-nlmsg-put-failure.patch
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