linux-kernel - Re: [PATCH] net: fm10k: fix a potential NULL pointer dereference

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Message-ID: <5bf2a409fb5f3fbb44ac3eda591ba0cbc6122d44.camel@intel.com>
Date:   Tue, 26 Mar 2019 15:21:41 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fm10k: fix a potential NULL pointer dereference

On Fri, 2019-03-22 at 22:26 -0500, Kangjie Lu wrote:
> > On Mar 11, 2019, at 1:17 AM, Kangjie Lu <kjlu@....edu> wrote:
> > 
> > In case alloc_workqueue fails, the fix returns -ENOMEM to avoid
> > potential NULL pointer dereference.
> > 
> > Signed-off-by: Kangjie Lu <kjlu@....edu>
> > ---
> > drivers/net/ethernet/intel/fm10k/fm10k_main.c | 2 ++
> > 1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > index 5a0419421511..215f232674f1 100644
> > --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
> > @@ -41,6 +41,8 @@ static int __init fm10k_init_module(void)
> > 	/* create driver workqueue */
> > 	fm10k_workqueue = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
> > 					  fm10k_driver_name);
> > +	if (unlikely(!fm10k_workqueue))
> > +		return -ENOMEM;
> > 
> 
> Jeff, can you review this patch?

Yep, sorry for the delay in getting back to you.  I already had this
change in my tree queued up from Yue Haibing.  I am actually preparing
to push this fix and few others to Dave in a couple of hours.

> 
> > 	fm10k_dbg_init();
> > 
> > -- 
> > 2.17.1
> > 


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