[3.19.y-ckt stable] Patch "xfrm: fix a race in xfrm_state_lookup_byspi" has been added to staging queue
Kamal Mostafa
kamal at canonical.com
Tue Jul 7 00:11:18 UTC 2015
This is a note to let you know that I have just added a patch titled
xfrm: fix a race in xfrm_state_lookup_byspi
to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue
This patch is scheduled to be released in version 3.19.8-ckt3.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
------
>From df249a1042a5077c8115fdaf6a1f0b6b61ee447b Mon Sep 17 00:00:00 2001
From: Li RongQing <roy.qing.li at gmail.com>
Date: Wed, 29 Apr 2015 08:42:44 +0800
Subject: xfrm: fix a race in xfrm_state_lookup_byspi
commit bdddbf6996c0b9299efc97b8f66e06286f3aa8c9 upstream.
The returned xfrm_state should be hold before unlock xfrm_state_lock,
otherwise the returned xfrm_state maybe be released.
Fixes: c454997e6[{pktgen, xfrm} Introduce xfrm_state_lookup_byspi..]
Cc: Fan Du <fan.du at intel.com>
Signed-off-by: Li RongQing <roy.qing.li at gmail.com>
Acked-by: Fan Du <fan.du at intel.com>
Signed-off-by: Steffen Klassert <steffen.klassert at secunet.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
net/xfrm/xfrm_state.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index de971b6..27348f0 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -927,8 +927,8 @@ struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
x->id.spi != spi)
continue;
- spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_hold(x);
+ spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
--
1.9.1
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