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authorEric Dumazet <dada1@cosmosbay.com>2008-10-16 17:18:29 -0400
committerDavid S. Miller <davem@davemloft.net>2008-10-16 17:18:29 -0400
commit00269b54edbf25f3bb0dccb558ae23a6fc77ed86 (patch)
tree63eb993fc8c463c5f6d023961b61b9dbaccd82cc /net/ipv4/route.c
parentdc976c09da4e13b2b3fda23cca9d0682d1de7213 (diff)
ipv4: Add a missing rcu_assign_pointer() in routing cache.
rt_intern_hash() is doing an update of a RCU guarded hash chain without using rcu_assign_pointer() or equivalent barrier. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a6d7c584f53b..8d23cc7efbad 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1109,7 +1109,12 @@ restart:
1109 printk("\n"); 1109 printk("\n");
1110 } 1110 }
1111#endif 1111#endif
1112 rt_hash_table[hash].chain = rt; 1112 /*
1113 * Since lookup is lockfree, we must make sure
1114 * previous writes to rt are comitted to memory
1115 * before making rt visible to other CPUS.
1116 */
1117 rcu_assign_pointer(rt_hash_table[hash].chain, rt);
1113 spin_unlock_bh(rt_hash_lock_addr(hash)); 1118 spin_unlock_bh(rt_hash_lock_addr(hash));
1114 *rp = rt; 1119 *rp = rt;
1115 return 0; 1120 return 0;