linux-kernel - Re: [PATCH] Convert BUG_ON to WARN_ON in bond

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Date:   Wed, 21 Jun 2017 11:33:20 -0700
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     Michael J Dilmore <michael.j.dilmore@...il.com>
cc:     vfalico@...il.com, andy@...yhouse.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, joe@...ches.com
Subject: Re: [PATCH] Convert BUG_ON to WARN_ON in bond_options.c

Michael J Dilmore <michael.j.dilmore@...il.com> wrote:

>The function below contains a BUG_ON where no active slave is detected. The patch
>converts this to a WARN_ON to avoid crashing the kernel.
>
>Signed-off-by: Michael J Dilmore <michael.j.dilmore@...il.com>
>---
> drivers/net/bonding/bond_options.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
>index 1bcbb89..c4b4791 100644
>--- a/drivers/net/bonding/bond_options.c
>+++ b/drivers/net/bonding/bond_options.c
>@@ -778,7 +778,7 @@ static int bond_option_active_slave_set(struct bonding *bond,
> 		struct slave *old_active = rtnl_dereference(bond->curr_active_slave);
> 		struct slave *new_active = bond_slave_get_rtnl(slave_dev);
> 
>-		BUG_ON(!new_active);
>+		WARN_ON(!new_active);

	This is a reasonable idea in principle, but will require
additional changes to prevent dereferencing new_active if it is NULL
(which would happen just below this point in the code).

	-J

> 		if (new_active == old_active) {
> 			/* do nothing */
>-- 
>2.7.4
>

---
	-Jay Vosburgh, jay.vosburgh@...onical.com