linux-kernel - Re: [PATCH] [v2] md: fix rcu protection in md_wakeup

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Message-Id: <1f8046dd-289d-488e-af86-5eee3b90e63e@fnnas.com>
Date: Tue, 21 Oct 2025 20:08:11 +0800
From: "Yu Kuai" <yukuai@...as.com>
To: "Yun Zhou" <yun.zhou@...driver.com>, <song@...nel.org>
Cc: <linux-raid@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v2] md: fix rcu protection in md_wakeup_thread

Hi,

在 2025/10/15 16:32, Yun Zhou 写道:
> We attempted to use RCU to protect the pointer 'thread', but directly
> passed the value when calling md_wakeup_thread(). This means that the
> RCU pointer has been acquired before rcu_read_lock(), which renders
> rcu_read_lock() ineffective and could lead to a use-after-free.
>
> Fixes: 446931543982 ("md: protect md_thread with rcu")
> Signed-off-by: Yun Zhou<yun.zhou@...driver.com>
> ---
>   drivers/md/md.c | 14 ++++++--------
>   drivers/md/md.h |  8 +++++++-
>   2 files changed, 13 insertions(+), 9 deletions(-)

Sorry for the delay.
Reviewed-by: Yu Kuai <yukuai@...as.com>