From: Jean Delvare <jdelvare@suse.de>
Date: Wed, 22 Apr 2009 07:49:51 +0000 (-0700)
Subject: net/netrom: Fix socket locking
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cc29c70dd581f85ee7a3e7980fb031f90b90a2ab;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

net/netrom: Fix socket locking

Patch "af_rose/x25: Sanity check the maximum user frame size"
(commit 83e0bbcbe2145f160fbaa109b0439dae7f4a38a9) from Alan Cox got
locking wrong. If we bail out due to user frame size being too large,
we must unlock the socket beforehand.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 4e705f87969..3be0e016ab7 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1084,8 +1084,10 @@ static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
 
 	/* Build a packet - the conventional user limit is 236 bytes. We can
 	   do ludicrously large NetROM frames but must not overflow */
-	if (len > 65536)
-		return -EMSGSIZE;
+	if (len > 65536) {
+		err = -EMSGSIZE;
+		goto out;
+	}
 
 	SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n");
 	size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;