linux-kernel - [PATCH] [RFC] net: dsa: mv88e6xxx: Pre-initialize err in mv88e6xxx_port_bridge

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Message-Id: <1461570761-12187-1-git-send-email-geert@linux-m68k.org>
Date:	Mon, 25 Apr 2016 09:52:41 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"David S. Miller" <davem@...emloft.net>,
	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] [RFC] net: dsa: mv88e6xxx: Pre-initialize err in mv88e6xxx_port_bridge_join()

drivers/net/dsa/mv88e6xxx.c: In function ‘mv88e6xxx_port_bridge_join’:
drivers/net/dsa/mv88e6xxx.c:2184: warning: ‘err’ may be used uninitialized in this function

If netdev_notifier_changeupper_info.upper_dev is ever NULL, the bridge
parameter will be NULL too, and the function will return an
uninitialized value.

Pre-initialize err to zero to fix this.

Fixes: 207afda1b5036009 ("net: dsa: mv88e6xxx: share the same default FDB")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Can this actually happen?
---
 drivers/net/dsa/mv88e6xxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index a2904029cccc2949..5e572b3510b9483a 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -2181,7 +2181,7 @@ int mv88e6xxx_port_bridge_join(struct dsa_switch *ds, int port,
 			       struct net_device *bridge)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
-	int i, err;
+	int i, err = 0;
 
 	mutex_lock(&ps->smi_mutex);
 
-- 
1.9.1