md: fix rcu protection in md_wakeup_thread

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[ Upstream commit 0dc7620554 ]

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.

Link: https://lore.kernel.org/linux-raid/20251015083227.1079009-1-yun.zhou@windriver.com
Fixes: 4469315439 ("md: protect md_thread with rcu")
Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
Reviewed-by: Li Nan <linan122@huawei.com>
Reviewed-by: Yu Kuai <yukuai@fnnas.com>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Yun Zhou 2025-10-15 16:32:27 +08:00 • committed by Greg Kroah-Hartman

parent 59392f424f

commit f98b191f78

2 changed files with 13 additions and 9 deletions

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14

drivers/md/md.c

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8

drivers/md/md.h

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