linux-kernel - Re: [PATCH] wifi: brcm80211: handle pmk

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Date: Tue, 27 Feb 2024 11:58:30 -0800
From: Joe Perches <joe@...ches.com>
To: Arend van Spriel <arend.vanspriel@...adcom.com>, Duoming Zhou
	 <duoming@....edu.cn>, linux-kernel@...r.kernel.org
Cc: brcm80211-dev-list.pdl@...adcom.com, brcm80211@...ts.linux.dev, 
 linux-wireless@...r.kernel.org, justinstitt@...gle.com, john@...ping.me.uk,
  quic_alokad@...cinc.com, marcan@...can.st, johannes.berg@...el.com, 
 linus.walleij@...aro.org, kvalo@...nel.org
Subject: Re: [PATCH] wifi: brcm80211: handle pmk_op allocation failure

On Tue, 2024-02-27 at 20:40 +0100, Arend van Spriel wrote:
> On 2/27/2024 12:42 PM, Joe Perches wrote:
> > On Tue, 2024-02-27 at 12:21 +0100, Arend van Spriel wrote:
> > > On 2/27/2024 9:06 AM, Duoming Zhou wrote:
> > > > The kzalloc() in brcmf_pmksa_v3_op() will return null if the
> > > > physical memory has run out. As a result, if we dereference
> > > > the null value, the null pointer dereference bug will happen.
> > > > 
> > > > Return -ENOMEM from brcmf_pmksa_v3_op() if kzalloc() fails
> > > > for pmk_op.
> > > 
> > > NAK (see below)
> > > 
> > > Also this issue was reported earlier by Joe Perches. Not sure if he
> > > wants to be mentioned as such.
> > 
> > I think it's unimportant to be mentioned.
> > 
> > I think it's more important that the code be researched
> > that the simple return of -ENOMEM the appropriate fix
> > and is handled by all possible callers of the function.
> 
> Right. That is what I did after which I replied on Feb 18 to your email.
> 
> https://lore.kernel.org/all/3e1f11b3-a689-4c8e-bfda-b43649db7106@broadcomcom/
> 

Right, I did that as well, but I didn't look up
the entire calling tree.

It likely works.  It's also likely better than
the write through of the null pointer.