Re: [PATCH v3] HID: hid-input: Fix accessing freed memory during device disconnect

[Jiri Kosina]

On Mon, 3 Aug 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() this
> memory is freed and the driver cannot access these members.
> 
> Fix this by storing the pointer to internal description of battery in a
> local variable before calling power_supply_unregister(), so the pointer
> remains valid.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> Reported-by: H.J. Lu <hjl.tools@xxxxxxxxx>
> Fixes: 297d716f6260 ("power_supply: Change ownership from driver to core")
> Cc: <stable@xxxxxxxxxxxxxxx>

Applied to for-4.2/upstream-fixes-devm-fixed, and thanks again Dmitry for 
catching my mistake.

-- 
Jiri Kosina
SUSE Labs
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