On Mon, Jun 20, 2016 at 12:50 PM, Marcin Niestroj
<m.niestroj@xxxxxxxxxxxxxxxx> wrote:
> This bug leads to:
>
> [ 1.906411] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
> [ 1.914878] pgd = c0004000
> [ 1.917786] [0000000c] *pgd=00000000
> [ 1.921536] Internal error: Oops: 5 [#1] SMP ARM
> [ 1.926357] Modules linked in:
> [ 1.929556] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.4.5 #18
> [ 1.936006] Hardware name: Generic AM33XX (Flattened Device Tree)
> [ 1.942383] Workqueue: events power_supply_changed_work
> [ 1.947842] task: de2c41c0 ti: de2c8000 task.ti: de2c8000
> [ 1.953483] PC is at tps65217_ac_get_property+0x14/0x28
> [ 1.958937] LR is at tps65217_ac_get_property+0x10/0x28
>
> Driver was trying to use drv_data in property get handler. However drv_data
> was not set, so it caused NULL pointer dereference. This patch properly
> sets drv_data during probe by power_supply_config parameter, so the
> property get handler works as desired.
>
> Signed-off-by: Marcin Niestroj <m.niestroj@xxxxxxxxxxxxxxxx>
> ---
> Changes v1 -> v4: none
This should crash on first try (get_property() is called just after
power supply register)... I wonder how was it working before...
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Fixes: 3636859b280c ("power_supply: Add support for tps65217-charger.")
Cc: <stable@xxxxxxxxxxxxxxx>
Best regards,
Krzysztof
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