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fib: add rtnl locking in ip_fib_net_exit

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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@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-03-30 16:57:46 -07:00 • committed by David S. Miller
parent c031235b39
commit e2666f8495
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/fib_frontend.c
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@ -1068,6 +1068,7 @@ static void ip_fib_net_exit(struct net *net)
fib4_rules_exit(net); fib4_rules_exit(net);
#endif #endif
rtnl_lock();
for (i = 0; i < FIB_TABLE_HASHSZ; i++) { for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
struct fib_table *tb; struct fib_table *tb;
struct hlist_head *head; struct hlist_head *head;
@ -1080,6 +1081,7 @@ static void ip_fib_net_exit(struct net *net)
fib_free_table(tb); fib_free_table(tb);
} }
} }
rtnl_unlock();
kfree(net->ipv4.fib_table_hash); kfree(net->ipv4.fib_table_hash);
} }