linux-kernel - Re: [PATCH 1/4] watchdog: imgpdc: Fix NULL pointer dereference on probe

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Date:	Tue, 31 Mar 2015 12:37:27 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naidu Tellapati <naidu.tellapati@...tec.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>
Subject: Re: [PATCH 1/4] watchdog: imgpdc: Fix NULL pointer dereference on probe

On Tue, Mar 31, 2015 at 11:49 AM, Andrew Bresticker
<abrestic@...omium.org> wrote:
> From: Naidu Tellapati <naidu.tellapati@...tec.com>
>
> pdc_wdt_probe() called pdc_wdt_stop() before watchdog_set_drvdata(),
> resulting in the following NULL pointer dereference:
>
>   CPU 0 Unable to handle kernel paging request at virtual address 0000008c, epc == 8082a2b8, ra == 8082a914
>   Oops[#1]:
>   CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc5+ #102
>   task: 8f8c0000 ti: 8f89e000 task.ti: 8f89e000
>   $ 0   : 00000000 8082a914 00000000 dc8ba200
>   $ 4   : 8faf9418 80ac0000 8f9cdc10 00008012
>   $ 8   : 00000000 806e2350 00000001 8f001880
>   $12   : 8f89fd14 00000000 00000000 65646f4d
>   $16   : 8faf9418 8f9cdc10 8f001880 8f9cdc00
>   $20   : 00000000 80c20000 00000000 80bc0000
>   $24   : 00000002 00000000
>   $28   : 8f89e000 8f89fd00 00000000 8082a914
>   Hi    : 0000006b
>   Lo    : 00008013
>   epc   : 8082a2b8 pdc_wdt_stop+0x1c/0x44
>       Not tainted
>   ra    : 8082a914 pdc_wdt_probe+0x404/0x550
>   Status: 11000403      KERNEL EXL IE
>   Cause : 00800008
>   BadVA : 0000008c
>   PrId  : 0001a120 (MIPS interAptiv (multi))
>
> Fix it by moving the call to pdc_wdt_stop() after we've set drvdata.

Disregard this patch and patch 2 - it looks like James Hogan beat me
to it :).  Patches 3 and 4 still apply I think.
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