From: Andrew Morton <akpm@linux-foundation.org>
To: mm-commits@vger.kernel.org,stable@vger.kernel.org,sj@kernel.org,liuyun01@kylinos.cn,akpm@linux-foundation.org
Subject: [merged mm-stable] mm-damon-stat-fix-memory-leak-on-damon_start-failure-in-damon_stat_start.patch removed from -mm tree
Date: Sat, 18 Apr 2026 00:54:28 -0700 [thread overview]
Message-ID: <20260418075433.BDFD4C19424@smtp.kernel.org> (raw)
The quilt patch titled
Subject: mm/damon/stat: fix memory leak on damon_start() failure in damon_stat_start()
has been removed from the -mm tree. Its filename was
mm-damon-stat-fix-memory-leak-on-damon_start-failure-in-damon_stat_start.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Jackie Liu <liuyun01@kylinos.cn>
Subject: mm/damon/stat: fix memory leak on damon_start() failure in damon_stat_start()
Date: Tue, 31 Mar 2026 18:15:53 +0800
Destroy the DAMON context and reset the global pointer when damon_start()
fails. Otherwise, the context allocated by damon_stat_build_ctx() is
leaked, and the stale damon_stat_context pointer will be overwritten on
the next enable attempt, making the old allocation permanently
unreachable.
Link: https://lore.kernel.org/20260331101553.88422-1-liu.yun@linux.dev
Fixes: 369c415e6073 ("mm/damon: introduce DAMON_STAT module")
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # 6.17.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/damon/stat.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/damon/stat.c~mm-damon-stat-fix-memory-leak-on-damon_start-failure-in-damon_stat_start
+++ a/mm/damon/stat.c
@@ -249,8 +249,11 @@ static int damon_stat_start(void)
if (!damon_stat_context)
return -ENOMEM;
err = damon_start(&damon_stat_context, 1, true);
- if (err)
+ if (err) {
+ damon_destroy_ctx(damon_stat_context);
+ damon_stat_context = NULL;
return err;
+ }
damon_stat_last_refresh_jiffies = jiffies;
call_control.data = damon_stat_context;
_
Patches currently in -mm which might be from liuyun01@kylinos.cn are
reply other threads:[~2026-04-18 7:54 UTC|newest]
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