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authorCong Wang <xiyou.wangcong@gmail.com>2018-12-10 11:49:55 -0800
committerDavid S. Miller <davem@davemloft.net>2018-12-14 13:16:33 -0800
commit15ef70e286176165d28b0b8a969b422561a68dfc (patch)
treeef79c96eb556365029d89323ab6b74b92495f12c /net/tipc
parentd3e8869ec82645599e6497d6974593bf00f7b19b (diff)
downloadlinux-stericsson-15ef70e286176165d28b0b8a969b422561a68dfc.tar.gz
tipc: use lock_sock() in tipc_sk_reinit()
lock_sock() must be used in process context to be race-free with other lock_sock() callers, for example, tipc_release(). Otherwise using the spinlock directly can't serialize a parallel tipc_release(). As it is blocking, we have to hold the sock refcnt before rhashtable_walk_stop() and release it after rhashtable_walk_start(). Fixes: 07f6c4bc048a ("tipc: convert tipc reference table to use generic rhashtable") Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Ying Xue <ying.xue@windriver.com> Cc: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index b57b1be7252b..e1396fb87779 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2724,11 +2724,15 @@ void tipc_sk_reinit(struct net *net)
rhashtable_walk_start(&iter);
while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
- spin_lock_bh(&tsk->sk.sk_lock.slock);
+ sock_hold(&tsk->sk);
+ rhashtable_walk_stop(&iter);
+ lock_sock(&tsk->sk);
msg = &tsk->phdr;
msg_set_prevnode(msg, tipc_own_addr(net));
msg_set_orignode(msg, tipc_own_addr(net));
- spin_unlock_bh(&tsk->sk.sk_lock.slock);
+ release_sock(&tsk->sk);
+ rhashtable_walk_start(&iter);
+ sock_put(&tsk->sk);
}
rhashtable_walk_stop(&iter);