netdev - [PATCH] net: usb: fix memory leak in smsc75xx

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Message-Id: <20210524200208.31621-1-paskripkin@gmail.com>
Date:   Mon, 24 May 2021 23:02:08 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     steve.glendinning@...well.net, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>, stable@...nel.vger.org,
        syzbot+b558506ba8165425fee2@...kaller.appspotmail.com
Subject: [PATCH] net: usb: fix memory leak in smsc75xx_bind

Syzbot reported memory leak in smsc75xx_bind().
The problem was is non-freed memory in case of
errors after memory allocation.

backtrace:
  [<ffffffff84245b62>] kmalloc include/linux/slab.h:556 [inline]
  [<ffffffff84245b62>] kzalloc include/linux/slab.h:686 [inline]
  [<ffffffff84245b62>] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460
  [<ffffffff82b5b2e6>] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728

Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver")
Cc: stable@...nel.vger.org
Reported-and-tested-by: syzbot+b558506ba8165425fee2@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/net/usb/smsc75xx.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index f8cdabb9ef5a..b286993da67c 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -1483,7 +1483,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	ret = smsc75xx_wait_ready(dev, 0);
 	if (ret < 0) {
 		netdev_warn(dev->net, "device not ready in smsc75xx_bind\n");
-		return ret;
+		goto err;
 	}
 
 	smsc75xx_init_mac_address(dev);
@@ -1492,7 +1492,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	ret = smsc75xx_reset(dev);
 	if (ret < 0) {
 		netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret);
-		return ret;
+		goto err;
 	}
 
 	dev->net->netdev_ops = &smsc75xx_netdev_ops;
@@ -1502,6 +1502,10 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
 	dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
 	return 0;
+
+err:
+	kfree(pdata);
+	return ret;
 }
 
 static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
-- 
2.31.1