diff options
| author | Bob Peterson <rpeterso@redhat.com> | 2017-08-23 10:43:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-10 07:42:46 -0800 |
| commit | 2185dbac9e81c1b757bc41bb77e7dd97edbf78e1 (patch) | |
| tree | 90cbc9b18438c4f969600fdb6806c57d0db6424d /net/tipc | |
| parent | b06b7882f7b43b2add69cd0389f94df2f54f55d0 (diff) | |
tipc: Fix tipc_sk_reinit handling of -EAGAIN
[ Upstream commit 6c7e983b220f89e03286dc70a41c7ef3a8b409df ]
In 9dbbfb0ab6680c6a85609041011484e6658e7d3c function tipc_sk_reinit
had additional logic added to loop in the event that function
rhashtable_walk_next() returned -EAGAIN. No worries.
However, if rhashtable_walk_start returns -EAGAIN, it does "continue",
and therefore skips the call to rhashtable_walk_stop(). That has
the effect of calling rcu_read_lock() without its paired call to
rcu_read_unlock(). Since rcu_read_lock() may be nested, the problem
may not be apparent for a while, especially since resize events may
be rare. But the comments to rhashtable_walk_start() state:
* ...Note that we take the RCU lock in all
* cases including when we return an error. So you must always call
* rhashtable_walk_stop to clean up.
This patch replaces the continue with a goto and label to ensure a
matching call to rhashtable_walk_stop().
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/tipc')
| -rw-r--r-- | net/tipc/socket.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 25bc5c30d7fb..9d3f047305ce 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -2277,8 +2277,8 @@ void tipc_sk_reinit(struct net *net) do { tsk = ERR_PTR(rhashtable_walk_start(&iter)); - if (tsk) - continue; + if (IS_ERR(tsk)) + goto walk_stop; while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { spin_lock_bh(&tsk->sk.sk_lock.slock); @@ -2287,7 +2287,7 @@ void tipc_sk_reinit(struct net *net) msg_set_orignode(msg, tn->own_addr); spin_unlock_bh(&tsk->sk.sk_lock.slock); } - +walk_stop: rhashtable_walk_stop(&iter); } while (tsk == ERR_PTR(-EAGAIN)); } |