From 6cb3ece9685f78f9b288dd2afea58c35784e40b8 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Fri, 20 Oct 2017 17:01:22 +0100
Subject: [PATCH] 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>
---
net/rxrpc/af_rxrpc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index fb17552fd292e..4b0a8288c98a6 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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