[PATCH AUTOSEL 6.1 52/60] kernel/fail_function: fix memory leak with using debugfs_lookup()

Sasha Levin
2023-03-03T22:38:05Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 2bb3669f576559db273efe49e0e69f82450efbca ]

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time. To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20230202151633.2310897-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/fail_function.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/fail_function.c b/kernel/fail_function.c
index a7ccd2930c5f4..d971a01893197 100644
--- a/kernel/fail_function.c
+++ b/kernel/fail_function.c
@@ -163,10 +163,7 @@ static void fei_debugfs_add_attr(struct fei_attr *attr)

static void fei_debugfs_remove_attr(struct fei_attr *attr)
{
- struct dentry *dir;
-
- dir = debugfs_lookup(attr->kp.symbol_name, fei_debugfs_dir);
- debugfs_remove_recursive(dir);
+ debugfs_lookup_and_remove(attr->kp.symbol_name, fei_debugfs_dir);
}

static int fei_kprobe_handler(struct kprobe *kp, struct pt_regs *regs)
--
2.39.2