From: sashiko-bot@kernel.org
To: "SJ Park" <sj@kernel.org>
Cc: damon@lists.linux.dev
Subject: Re: [RFC PATCH 6.1.y 1/2] mm/damon/sysfs: put target pids for damon_start() failure
Date: Wed, 28 Oct 2026 05:20:34 +0000 [thread overview]
Message-ID: <sashiko-outbox-187526@kernel.org> (raw)
In-Reply-To: <20261028051104.154232-2-sj@kernel.org>
> damon_sysfs_turn_damon_on() allocates and sets up damon_ctx to start.
> If it is for virtual address space monitoring, the setup increases the
> reference counts of the target pids. After the setup, the function
> invokes damon_start(). If damon_start() fails, it deallocates the
> damon_ctx object without decreasing the reference counts of target pids.
> As a result, pids can be leaked.
>
> Fix the leak by putting pids using damon_sysfs_destroy_targets() before
> deallocating the damon_ctx object.
>
> Fixes: a61ea561c871 ("mm/damon/sysfs: link DAMON for virtual address spaces monitoring")
> Cc: <stable@vger.kernel.org> # 5.18.x
> Signed-off-by: SJ Park <sj@kernel.org>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261028051104.154232-1-sj@kernel.org?part=1
next prev parent reply other threads:[~2026-10-28 5:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 5:11 [RFC PATCH 6.1.y 0/2] mm/damon/sysfs: fix pid leaks from wrong error handlings SJ Park
2026-10-28 5:11 ` [RFC PATCH 6.1.y 1/2] mm/damon/sysfs: put target pids for damon_start() failure SJ Park
2026-10-28 5:20 ` sashiko-bot [this message]
2026-10-28 5:11 ` [RFC PATCH 6.1.y 2/2] mm/damon/sysfs: put target pids for apply_inputs() failure SJ Park
2026-10-28 5:19 ` sashiko-bot
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