linux-kernel - Re: [PATCH] HID: hid-input: Fix accessing freed memory during driver unbind

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Message-ID: <alpine.LNX.2.00.1507291506500.925@pobox.suse.cz>
Date:	Wed, 29 Jul 2015 15:07:04 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	sre@...nel.org, linux-pm@...r.kernel.org,
	"H.J. Lu" <hjl.tools@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH] HID: hid-input: Fix accessing freed memory during driver
 unbind

On Tue, 28 Jul 2015, Krzysztof Kozlowski wrote:

> During unbinding the driver was dereferencing a pointer to memory
> already freed by power_supply_unregister().
> 
> Driver was freeing its internal description of battery through pointers
> stored in power_supply structure. However, because the core owns the
> power supply instance, after calling power_supply_unregister() the
> driver cannot access these members.
> 
> Fix this by using resource-managed allocations so internal data will be
> freed by pointers stored in resource-managed core.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reported-by: H.J. Lu <hjl.tools@...il.com>
> Fixes: 297d716f6260 ("power_supply: Change ownership from driver to core")
> Cc: <stable@...r.kernel.org>

Applied to for-4.2/upstream-fixes, thanks.

-- 
Jiri Kosina
SUSE Labs
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