[PATCH 21/31] netfilter: NF_QUEUE vs emergency skbs

[Suresh Jayaraman]

From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> 

Avoid memory getting stuck waiting for userspace, drop all emergency packets.
This of course requires the regular storage route to not include an NF_QUEUE
target ;-)

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Suresh Jayaraman <sjayaraman@xxxxxxx>
---
 net/netfilter/core.c |    3 +++
 1 file changed, 3 insertions(+)

Index: mmotm/net/netfilter/core.c
===================================================================
--- mmotm.orig/net/netfilter/core.c
+++ mmotm/net/netfilter/core.c
@@ -175,9 +175,12 @@ next_hook:
 	if (verdict == NF_ACCEPT || verdict == NF_STOP) {
 		ret = 1;
 	} else if (verdict == NF_DROP) {
+drop:
 		kfree_skb(skb);
 		ret = -EPERM;
 	} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
+		if (skb_emergency(skb))
+			goto drop;
 		if (!nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
 			      verdict >> NF_VERDICT_BITS))
 			goto next_hook;
--
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