netdev - Re: [Bugme-new] [Bug 9937] New: Bug in bonding driver - Kernel oops whenever driver is loaded with max

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Date:	Mon, 11 Feb 2008 17:21:19 -0800
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	kantica@...il.com, stable@...nel.vger.org
Subject: Re: [Bugme-new] [Bug 9937] New: Bug in bonding driver - Kernel oops whenever driver is loaded with max_bonds parameter 

Andrew Morton <akpm@...ux-foundation.org> wrote:

>> Problem Description: Kernel oops whenever bonding driver with max_bonds=2 (or >
>> 2) is loaded ...

	I believe this is fixed by the following (from linux-2.6):

From: Jay Vosburgh <fubar@...ibm.com>
Date: Tue, 29 Jan 2008 18:07:45 -0800
Subject: [PATCH] bonding: fix NULL pointer deref in startup processing

	Fix the "are we creating a duplicate" check to not compare
the name if the name is NULL (meaning that the system should select
a name).  Bug reported by Benny Amorsen <benny+usenet@...rsen.dk>.

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
Signed-off-by: Jeff Garzik <jeff@...zik.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/bonding/bond_main.c |   16 +++++++++-------
 1 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 65c7eba..81b4574 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4896,14 +4896,16 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
 	down_write(&bonding_rwsem);
 
 	/* Check to see if the bond already exists. */
-	list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
-		if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
-			printk(KERN_ERR DRV_NAME
+	if (name) {
+		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
+			if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
+				printk(KERN_ERR DRV_NAME
 			       ": cannot add bond %s; it already exists\n",
-			       name);
-			res = -EPERM;
-			goto out_rtnl;
-		}
+				       name);
+				res = -EPERM;
+				goto out_rtnl;
+			}
+	}
 
 	bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
 				ether_setup);
-- 
1.5.2.4

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