linux-kernel - Re: [PATCH v2] posix-clock: posix-clock: Fix unbalanced locking in pc_clock

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Message-ID: <878qug78sj.fsf@somnus>
Date: Tue, 22 Oct 2024 12:04:44 +0200
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: Jinjie Ruan <ruanjinjie@...wei.com>, frederic@...nel.org,
 tglx@...utronix.de, kuba@...nel.org, ruanjinjie@...wei.com,
 richardcochran@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] posix-clock: posix-clock: Fix unbalanced locking in
 pc_clock_settime()

Jinjie Ruan <ruanjinjie@...wei.com> writes:

> If get_clock_desc() succeeds, it calls fget() for the clockid's fd,
> and get the clk->rwsem read lock, so the error path should release
> the lock to make the lock balance and fput the clockid's fd to make
> the refcount balance and release the fd related reosurce.

There is a typo: reosurce

>
> However the below commit left the error path locked behind resulting in
> unbalanced locking. Check timespec64_valid_strict() before
> get_clock_desc() to fix it, because the "ts" is not changed
> after that.
>
> Fixes: d8794ac20a29 ("posix-clock: Fix missing timespec64 check in pc_clock_settime()")
> Acked-by: Richard Cochran <richardcochran@...il.com>
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>

Acked-by: Anna-Maria Behnsen <anna-maria@...utronix.de>