Re: [RFC PATCH] futex: Fix futex_waitv() hrtimer debug object leak on kcalloc error

[Davidlohr Bueso]

On Wed, 14 Dec 2022, Mathieu Desnoyers wrote:

> In a scenario where kcalloc() fails to allocate memory, the futex_waitv
> system call immediately returns -ENOMEM without invoking
> destroy_hrtimer_on_stack(). When CONFIG_DEBUG_OBJECTS_TIMERS=y, this
> results in leaking a timer debug object.
>
> Fixes: bf69bad38cf6 ("futex: Implement sys_futex_waitv()")
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> Cc: Andre Almeida <andrealmeid@xxxxxxxxxxxxx>
> Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Darren Hart <dvhart@xxxxxxxxxxxxx>
> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v5.16+

Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>