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authorDavid Howells <dhowells@redhat.com>2017-10-20 17:01:22 +0100
committerDavid S. Miller <davem@davemloft.net>2017-10-22 03:05:39 +0100
commit6cb3ece9685f78f9b288dd2afea58c35784e40b8 (patch)
tree64c816bc23b70513cd8f44638d40486acbbc8fb2
parent748759d57e1b33427113bad7dc685ea3c139649e (diff)
rxrpc: Don't release call mutex on error pointer
Don't release call mutex at the end of rxrpc_kernel_begin_call() if the call pointer actually holds an error value. Fixes: 540b1c48c37a ("rxrpc: Fix deadlock between call creation and sendmsg/recvmsg") Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/rxrpc/af_rxrpc.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index fb17552fd292..4b0a8288c98a 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -308,10 +308,11 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
gfp);
/* The socket has been unlocked. */
- if (!IS_ERR(call))
+ if (!IS_ERR(call)) {
call->notify_rx = notify_rx;
+ mutex_unlock(&call->user_mutex);
+ }
- mutex_unlock(&call->user_mutex);
_leave(" = %p", call);
return call;
}

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