[19/70] fib: add rtnl locking in ip_fib_net_exit

[Greg KH]

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Eric Dumazet <eric.dumazet@xxxxxxxxx>

[ Upstream commit e2666f84958adb3a034b98e99699b55705117e01 ]

Daniel J Blueman reported a lockdep splat in trie_firstleaf(), caused by
RTNL being not locked before a call to fib_table_flush()

Reported-by: Daniel J Blueman <daniel.blueman@xxxxxxxxx>
Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 net/ipv4/fib_frontend.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1041,6 +1041,7 @@ static void ip_fib_net_exit(struct net *
 	fib4_rules_exit(net);
 #endif
 
+	rtnl_lock();
 	for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
 		struct fib_table *tb;
 		struct hlist_head *head;
@@ -1053,6 +1054,7 @@ static void ip_fib_net_exit(struct net *
 			fib_free_table(tb);
 		}
 	}
+	rtnl_unlock();
 	kfree(net->ipv4.fib_table_hash);
 }
 


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