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| author | Patrick McHardy <kaber@trash.net> | 2006-03-20 22:40:54 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-03-20 22:40:54 -0800 |
| commit | be33690d8fcf40377f16193c463681170eb6b295 (patch) | |
| tree | 08c7be2ba1d046fca40bbb1d3ddac789b393ecc9 /net/xfrm | |
| parent | 15d99e02babae8bc20b836917ace07d93e318149 (diff) | |
| download | linux-be33690d8fcf40377f16193c463681170eb6b295.tar.gz linux-be33690d8fcf40377f16193c463681170eb6b295.tar.bz2 linux-be33690d8fcf40377f16193c463681170eb6b295.zip | |
[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 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_user.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 4a7120a7e10f..81d1005830f4 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1947,12 +1947,15 @@ static struct xfrm_mgr netlink_mgr = { static int __init xfrm_user_init(void) { + struct sock *nlsk; + printk(KERN_INFO "Initializing IPsec netlink socket\n"); - xfrm_nl = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, - xfrm_netlink_rcv, THIS_MODULE); - if (xfrm_nl == NULL) + nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX, + xfrm_netlink_rcv, THIS_MODULE); + if (nlsk == NULL) return -ENOMEM; + rcu_assign_pointer(xfrm_nl, nlsk); xfrm_register_km(&netlink_mgr); @@ -1961,8 +1964,12 @@ static int __init xfrm_user_init(void) static void __exit xfrm_user_exit(void) { + struct sock *nlsk = xfrm_nl; + xfrm_unregister_km(&netlink_mgr); - sock_release(xfrm_nl->sk_socket); + rcu_assign_pointer(xfrm_nl, NULL); + synchronize_rcu(); + sock_release(nlsk->sk_socket); } module_init(xfrm_user_init); |