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authorPatrick McHardy <kaber@trash.net>2006-03-20 22:40:54 -0800
committerDavid S. Miller <davem@davemloft.net>2006-03-20 22:40:54 -0800
commitbe33690d8fcf40377f16193c463681170eb6b295 (patch)
tree08c7be2ba1d046fca40bbb1d3ddac789b393ecc9 /include
parent15d99e02babae8bc20b836917ace07d93e318149 (diff)
downloadlinux-be33690d8fcf40377f16193c463681170eb6b295.tar.bz2
[XFRM]: Fix aevent related crash
When xfrm_user isn't loaded xfrm_nl is NULL, which makes IPsec crash because xfrm_aevent_is_on passes the NULL pointer to netlink_has_listeners as socket. A second problem is that the xfrm_nl pointer is not cleared when the socket is releases at module unload time. Protect references of xfrm_nl from outside of xfrm_user by RCU, check that the socket is present in xfrm_aevent_is_on and set it to NULL when unloading xfrm_user. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/xfrm.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 786371365f2b..61b7504fc2ba 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1001,7 +1001,15 @@ static inline int xfrm_policy_id2dir(u32 index)
static inline int xfrm_aevent_is_on(void)
{
- return netlink_has_listeners(xfrm_nl,XFRMNLGRP_AEVENTS);
+ struct sock *nlsk;
+ int ret = 0;
+
+ rcu_read_lock();
+ nlsk = rcu_dereference(xfrm_nl);
+ if (nlsk)
+ ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
+ rcu_read_unlock();
+ return ret;
}
static inline void xfrm_aevent_doreplay(struct xfrm_state *x)