linux-kernel - [PATCH] flowcache: Fix kernel panic in flow_cache_flush

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Message-ID: <20150205153649.GA3278@miroslavurbanek.com>
Date:	Thu, 5 Feb 2015 16:36:50 +0100
From:	Miroslav Urbanek <mu@...oslavurbanek.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tomáš Charvát <tc@...ello.cz>,
	Jan Hejl <jh@...ello.cz>
Subject: [PATCH] flowcache: Fix kernel panic in flow_cache_flush_task

flow_cache_flush_task references a structure member flow_cache_gc_work
where it should reference flow_cache_flush_task instead.

Kernel panic occurs on kernels using IPsec during XFRM garbage
collection. The garbage collection interval can be shortened using the
following sysctl settings:

net.ipv4.xfrm4_gc_thresh=4
net.ipv6.xfrm6_gc_thresh=4

With the default settings, our productions servers crash approximately
once a week. With the settings above, they crash immediately.

Fixes: ca925cf1534e ("flowcache: Make flow cache name space aware")
Reported-by: Tomáš Charvát <tc@...ello.cz>
Tested-by: Jan Hejl <jh@...ello.cz>
Signed-off-by: Miroslav Urbanek <mu@...oslavurbanek.com>
---
 net/core/flow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/flow.c b/net/core/flow.c
index a0348fd..1033725 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -379,7 +379,7 @@ done:
 static void flow_cache_flush_task(struct work_struct *work)
 {
 	struct netns_xfrm *xfrm = container_of(work, struct netns_xfrm,
-						flow_cache_gc_work);
+						flow_cache_flush_work);
 	struct net *net = container_of(xfrm, struct net, xfrm);
 
 	flow_cache_flush(net);
-- 
2.0.4

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