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authorEric Dumazet <edumazet@google.com>2016-04-01 08:52:15 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-04 22:11:19 -0400
commit2d331915a04144dad738e725769d8fac06ef6155 (patch)
tree5bf80c73627b0783603e8a46573db2cf50041280 /net/ipv4/inet_diag.c
parenttcp/dccp: remove BH disable/enable in lookup (diff)
downloadlinux-dev-2d331915a04144dad738e725769d8fac06ef6155.tar.xz
linux-dev-2d331915a04144dad738e725769d8fac06ef6155.zip
tcp/dccp: use rcu locking in inet_diag_find_one_icsk()
RX packet processing holds rcu_read_lock(), so we can remove pairs of rcu_read_lock()/rcu_read_unlock() in lookup functions if inet_diag also holds rcu before calling them. This is needed anyway as __inet_lookup_listener() and inet6_lookup_listener() will soon no longer increment refcount on the found listener. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_diag.c')
-rw-r--r--net/ipv4/inet_diag.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 5fdb02f5598e..ea8df527b279 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -356,6 +356,7 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
{
struct sock *sk;
+ rcu_read_lock();
if (req->sdiag_family == AF_INET)
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
req->id.idiag_dport, req->id.idiag_src[0],
@@ -376,9 +377,11 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
req->id.idiag_if);
}
#endif
- else
+ else {
+ rcu_read_unlock();
return ERR_PTR(-EINVAL);
-
+ }
+ rcu_read_unlock();
if (!sk)
return ERR_PTR(-ENOENT);