linux-kernel - [PATCH AUTOSEL 6.6 4/4] ksmbd: use list_first_entry_or_null for opinfo_get

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Message-Id: <20250527023756.1017237-4-sashal@kernel.org>
Date: Mon, 26 May 2025 22:37:56 -0400
From: Sasha Levin <sashal@...nel.org>
To: patches@...ts.linux.dev,
	stable@...r.kernel.org
Cc: Namjae Jeon <linkinjeon@...nel.org>,
	kernel test robot <lkp@...el.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Steve French <stfrench@...rosoft.com>,
	Sasha Levin <sashal@...nel.org>,
	smfrench@...il.com,
	linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 4/4] ksmbd: use list_first_entry_or_null for opinfo_get_list()

From: Namjae Jeon <linkinjeon@...nel.org>

[ Upstream commit 10379171f346e6f61d30d9949500a8de4336444a ]

The list_first_entry() macro never returns NULL.  If the list is
empty then it returns an invalid pointer.  Use list_first_entry_or_null()
to check if the list is empty.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202505080231.7OXwq4Te-lkp@intel.com/
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/smb/server/oplock.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c
index 72294764d4c20..e564432643ea3 100644
--- a/fs/smb/server/oplock.c
+++ b/fs/smb/server/oplock.c
@@ -146,12 +146,9 @@ static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci)
 {
 	struct oplock_info *opinfo;
 
-	if (list_empty(&ci->m_op_list))
-		return NULL;
-
 	down_read(&ci->m_lock);
-	opinfo = list_first_entry(&ci->m_op_list, struct oplock_info,
-					op_entry);
+	opinfo = list_first_entry_or_null(&ci->m_op_list, struct oplock_info,
+					  op_entry);
 	if (opinfo) {
 		if (opinfo->conn == NULL ||
 		    !atomic_inc_not_zero(&opinfo->refcount))
-- 
2.39.5