linux-kernel - RE: [EXT] Re: [PATCH] mwifiex: check for null return from skb

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Date:   Sun, 2 Jun 2019 01:56:44 +0000
From:   Ganapathi Bhat <gbhat@...vell.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     Colin King <colin.king@...onical.com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH] mwifiex: check for null return from skb_copy

Hi Dan,

> > > >  	if (is_multicast_ether_addr(ra)) {
> > > >  		skb_uap = skb_copy(skb, GFP_ATOMIC);
> > > > +		if (!skb_uap)
> > > > +			return -ENOMEM;
> > >
> > > I think we would want to free dev_kfree_skb_any(skb) before returning.
> > I think if the pointer is NULL, no need to free it;
> 
> You're misreading skb vs skb_uap.  "skb_uap" is NULL but "skb" is non-NULL
> and I'm pretty sure we should free it.

Oh, right. I missed it; Yes you are correct.

Regards,
Ganapathi