linux-kernel - [PATCH 4.9 54/62] net: usb: sr9800: fix uninitialized local variable

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Message-Id: <20191104211955.323387139@linuxfoundation.org>
Date:   Mon,  4 Nov 2019 22:45:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+f1842130bbcfb335bac1@...kaller.appspotmail.com,
        Valentin Vidic <vvidic@...entin-vidic.from.hr>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 54/62] net: usb: sr9800: fix uninitialized local variable

From: Valentin Vidic <vvidic@...entin-vidic.from.hr>

commit 77b6d09f4ae66d42cd63b121af67780ae3d1a5e9 upstream.

Make sure res does not contain random value if the call to
sr_read_cmd fails for some reason.

Reported-by: syzbot+f1842130bbcfb335bac1@...kaller.appspotmail.com
Signed-off-by: Valentin Vidic <vvidic@...entin-vidic.from.hr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/usb/sr9800.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/sr9800.c
+++ b/drivers/net/usb/sr9800.c
@@ -336,7 +336,7 @@ static void sr_set_multicast(struct net_
 static int sr_mdio_read(struct net_device *net, int phy_id, int loc)
 {
 	struct usbnet *dev = netdev_priv(net);
-	__le16 res;
+	__le16 res = 0;
 
 	mutex_lock(&dev->phy_mutex);
 	sr_set_sw_mii(dev);