linux-kernel - [PATCH -next v2] xtensa: iss: fix handling error cases in iss_net

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Thu, 7 Jul 2022 10:32:29 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-xtensa@...ux-xtensa.org>
CC:     <chris@...kel.net>, <jcmvbkbc@...il.com>
Subject: [PATCH -next v2] xtensa: iss: fix handling error cases in iss_net_configure()

The 'pdev' and 'netdev' need be release in error cases of iss_net_configure().
In orde to fix this, add two labels for error case to release them.

And Change the return type of iss_net_configure() to void, because it's not used.

Fixes: 7282bee78798 ("[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 8")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
v2:
  change return type of iss_net_configure() to void
---
 arch/xtensa/platforms/iss/network.c | 33 ++++++++++++++---------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
index fd84d4891758..aeb5828a639c 100644
--- a/arch/xtensa/platforms/iss/network.c
+++ b/arch/xtensa/platforms/iss/network.c
@@ -472,16 +472,15 @@ static const struct net_device_ops iss_netdev_ops = {
 	.ndo_set_rx_mode	= iss_net_set_multicast_list,
 };
 
-static int iss_net_configure(int index, char *init)
+static void iss_net_configure(int index, char *init)
 {
 	struct net_device *dev;
 	struct iss_net_private *lp;
-	int err;
 
 	dev = alloc_etherdev(sizeof(*lp));
 	if (dev == NULL) {
 		pr_err("eth_configure: failed to allocate device\n");
-		return 1;
+		return;
 	}
 
 	/* Initialize private element. */
@@ -509,7 +508,7 @@ static int iss_net_configure(int index, char *init)
 	if (!tuntap_probe(lp, index, init)) {
 		pr_err("%s: invalid arguments. Skipping device!\n",
 		       dev->name);
-		goto errout;
+		goto err_free_netdev;
 	}
 
 	pr_info("Netdevice %d (%pM)\n", index, dev->dev_addr);
@@ -517,7 +516,8 @@ static int iss_net_configure(int index, char *init)
 	/* sysfs register */
 
 	if (!driver_registered) {
-		platform_driver_register(&iss_net_driver);
+		if (platform_driver_register(&iss_net_driver))
+			goto err_free_netdev;
 		driver_registered = 1;
 	}
 
@@ -527,7 +527,8 @@ static int iss_net_configure(int index, char *init)
 
 	lp->pdev.id = index;
 	lp->pdev.name = DRIVER_NAME;
-	platform_device_register(&lp->pdev);
+	if (platform_device_register(&lp->pdev))
+		goto err_free_netdev;
 	SET_NETDEV_DEV(dev, &lp->pdev.dev);
 
 	dev->netdev_ops = &iss_netdev_ops;
@@ -536,23 +537,21 @@ static int iss_net_configure(int index, char *init)
 	dev->irq = -1;
 
 	rtnl_lock();
-	err = register_netdevice(dev);
-	rtnl_unlock();
-
-	if (err) {
+	if (register_netdevice(dev)) {
+		rtnl_unlock();
 		pr_err("%s: error registering net device!\n", dev->name);
-		/* XXX: should we call ->remove() here? */
-		free_netdev(dev);
-		return 1;
+		goto err_unregister_device;
 	}
+	rtnl_unlock();
 
 	timer_setup(&lp->tl, iss_net_user_timer_expire, 0);
 
-	return 0;
+	return;
 
-errout:
-	/* FIXME: unregister; free, etc.. */
-	return -EIO;
+err_unregister_device:
+	platform_device_unregister(&lp->pdev);
+err_free_netdev:
+	free_netdev(dev);
 }
 
 /* ------------------------------------------------------------------------- */
-- 
2.25.1