ksmbd: use list_first_entry_or_null for opinfo_get_list()
[ 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@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202505080231.7OXwq4Te-lkp@intel.com/
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c
index 7229476..e564432 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))
