linux-kernel - Re: [PATCH 2/4] carl9170: fix debugfs crashes

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Message-ID: <87y42p5end.fsf@kamboji.qca.qualcomm.com>
Date:   Sun, 18 Sep 2016 19:57:57 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christian Lamparter <chunkeey@...glemail.com>,
        Christian Lamparter <chunkeey@...il.com>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        b43-dev@...ts.infradead.org, Nicolai Stange <nicstange@...il.com>,
        Ben Greear <greearb@...delatech.com>,
        Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH 2/4] carl9170: fix debugfs crashes

Greg KH <gregkh@...uxfoundation.org> writes:

> On Sun, Sep 18, 2016 at 10:54:18AM +0300, Kalle Valo wrote:
>> Greg KH <gregkh@...uxfoundation.org> writes:
>> 
>> > On Sat, Sep 17, 2016 at 09:43:02PM +0200, Christian Lamparter wrote:
>> >> Ben Greear reported:
>> >> > I see lots of instability as soon as I load up the carl9710 NIC.
>> >> > My application is going to be poking at it's debugfs files...
>> >> >
>> >> > BUG: KASAN: slab-out-of-bounds in carl9170_debugfs_read+0xd5/0x2a0
>> >> > [carl9170] at addr ffff8801bc1208b0
>> >> > Read of size 8 by task btserver/5888
>> >> > =======================================================================
>> >> > BUG kmalloc-256 (Tainted: G        W      ): kasan: bad access detected
>> >> > -----------------------------------------------------------------------
>> >> >
>> >> > INFO: Allocated in seq_open+0x50/0x100 age=2690 cpu=2 pid=772
>> >> >...
>> >> 
>> >> This breakage was caused by the introduction of intermediate
>> >> fops in debugfs by commit 9fd4dcece43a
>> >> ("debugfs: prevent access to possibly dead file_operations at file open")
>> >
>> > Because of this, these should all be backported to 4.7-stable, and
>> > 4.8-stable, right?
>> 
>> Via which tree should these go, Greg's or mine?
>
> I'll take it if you ack it, as it's a debugfs issue.

Good, thanks. The wireless patches look good to me so:

Acked-by: Kalle Valo <kvalo@...eaurora.org>

-- 
Kalle Valo