linux-kernel - Re: [ofa-general] [GIT PULL] please pull infiniband.git

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Date:	Tue, 27 Nov 2007 10:59:48 +0200
From:	Jack Morgenstein <jackm@....mellanox.co.il>
To:	general@...ts.openfabrics.org
Cc:	Roland Dreier <rdreier@...co.com>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [ofa-general] [GIT PULL] please pull infiniband.git

On Tuesday 27 November 2007 08:21, Roland Dreier wrote:
> Linus, please pull from
> 
>     master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git for-linus
> 
> 
> Jack Morgenstein (1):
>       mlx4_core: Fix state check in mlx4_qp_modify()
> 
MUST also enter the patch I send yesterday:
[PATCH] ipoib: fix kernel Oops resulting from xmit when priv->broadcast is NULL.

(critical bug fix -- will get kernel Oopses whenever ports on the network go down!).
(patch given again below)

- Jack
======================================================================================================================
IPoIB: Fix kernel Oops resulting from xmit following dev_down.

If a port goes down, ipoib_ib_dev_down is invoked -- which flushed the mcasts (clearing
priv->broadcast) and clearing the path record cache. If ipoib_start_xmit is then invoked (before
the port is upped), a kernel Oops results from attempting to access priv->broadcast.

Returning NULL if priv->broadcast is NULL is a harmless way of bypassing the problem -- the
offending packet is simply discarded "without prejudice".

Signed-off-by: Jack Morgenstein <jackm@....mellanox.co.il>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index a03a65e..c9f6077 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -460,6 +460,9 @@ static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ipoib_path *path;
 
+	if (!priv->broadcast)
+		return NULL;
+
 	path = kzalloc(sizeof *path, GFP_ATOMIC);
 	if (!path)
 		return NULL;
-
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