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SubjectRe: [PATCH] net: phy: phy_led_triggers: Fix a possible null-pointer dereference in phy_led_trigger_change_speed()
On Mon, Jul 29, 2019 at 05:24:24PM +0800, Jia-Ju Bai wrote:
> In phy_led_trigger_change_speed(), there is an if statement on line 48
> to check whether phy->last_triggered is NULL:
> if (!phy->last_triggered)
>
> When phy->last_triggered is NULL, it is used on line 52:
> led_trigger_event(&phy->last_triggered->trigger, LED_OFF);
>
> Thus, a possible null-pointer dereference may occur.
>
> To fix this bug, led_trigger_event(&phy->last_triggered->trigger,
> LED_OFF) is called when phy->last_triggered is not NULL.
>
> This bug is found by a static analysis tool STCheck written by us.

Who is 'us'?

Thanks
Andrew

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