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mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure

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commit 9814cc832b88bd040fc2a1817c2b5469d0f7e862 upstream.

When a context DAMON sysfs directory setup is failed after setup of attrs/
directory, subdirectories of attrs/ directory are not cleaned up.  As a
result, DAMON sysfs interface is nearly broken until the system reboots,
and the memory for the unremoved directory is leaked.

Cleanup the directories under such failures.

Link: https://lkml.kernel.org/r/20251225023043.18579-3-sj@kernel.org
Fixes: c951cd3b89 ("mm/damon: implement a minimal stub for sysfs-based DAMON interface")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: chongjiapeng <jiapeng.chong@linux.alibaba.com>
Cc: <stable@vger.kernel.org> # 5.18.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
SeongJae Park 2025-12-24 18:30:35 -08:00 committed by Greg Kroah-Hartman
parent 9dc11b365e
commit 78b4eb9975
1 changed files with 3 additions and 2 deletions
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5
mm/damon/sysfs.c
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@ -922,7 +922,7 @@ static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context)
err = damon_sysfs_context_set_targets(context);
if (err)
goto put_attrs_out;
goto rmdir_put_attrs_out;
err = damon_sysfs_context_set_schemes(context);
if (err)
@ -932,7 +932,8 @@ static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context)
put_targets_attrs_out:
kobject_put(&context->targets->kobj);
context->targets = NULL;
put_attrs_out:
rmdir_put_attrs_out:
damon_sysfs_attrs_rm_dirs(context->attrs);
kobject_put(&context->attrs->kobj);
context->attrs = NULL;
return err;