Re: [PATCH 3/6] backlight: qcom-wled: Cancel delayed work on probe failure

[Konrad Dybcio]

On 11/4/26 7:39 PM, Lee Jones wrote:
> If a short interrupt fires after wled_configure_short_irq() has
> registered the interrupt handler, wled_short_irq_handler() calls
> wled_module_enable(), which schedules wled->ovp_work.
> 
> If wled_probe() subsequently fails during
> devm_backlight_device_register(), devres frees the wled structure while
> wled->ovp_work remains pending, leading to a use-after-free when
> wled_ovp_work() executes.
> 
> Configure the OVP interrupt first, then initialise wled->ovp_work via
> devm_delayed_work_autocancel() before requesting the short interrupt.
> This ensures that on teardown devres frees the short interrupt first,
> cancels any pending wled->ovp_work while wled->ovp_irq is still valid,
> and finally frees the OVP interrupt and wled structure.
> 
> Fixes: 8663c188beea ("backlight: qcom-wled: Add auto string detection logic")
> Closes: https://sashiko.dev/#/bug/linux-ca2e48a2-f511-44b8-a7d4-866f360bf107
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

Konrad