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mm/shrinker: fix name consistency issue in shrinker_debugfs_rename()

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After calling debugfs_change_name function, the return value should be
checked and the old name restored.  If debugfs_change_name fails, the new
name memory should be freed.  The effect is that the shrinker->name is not
consistent with the name displayed in debugfs.

Link: https://lkml.kernel.org/r/20250305071759.661055-1-liuye@kylinos.cn
Signed-off-by: Liu Ye <liuye@kylinos.cn>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by：Qi Zheng <zhengqi.arch@bytedance.co
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liu Ye 2025-03-05 15:17:59 +08:00 • committed by Andrew Morton
parent 9ea705a54b
commit ac55b38fe2
1 changed files with 6 additions and 2 deletions
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8
mm/shrinker_debug.c
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@ -214,10 +214,14 @@ int shrinker_debugfs_rename(struct shrinker *shrinker, const char *fmt, ...)
ret = debugfs_change_name(shrinker->debugfs_entry, "%s-%d",
shrinker->name, shrinker->debugfs_id);
if (ret) {
shrinker->name = old;
kfree_const(new);
} else {
kfree_const(old);
}
mutex_unlock(&shrinker_mutex);
kfree_const(old);
return ret;
}
EXPORT_SYMBOL(shrinker_debugfs_rename);