5.15-stable review patch. If anyone has any objections, please let me know.
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From: ChenXiaoSong chenxiaosong@kylinos.cn
commit 4e8771a3666c8f216eefd6bd2fd50121c6c437db upstream.
null-ptr-deref will occur when (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) and parse_lease_state() return NULL.
Fix this by check if 'lease_ctx_info' is NULL.
Additionally, remove the redundant parentheses in parse_durable_handle_context().
Signed-off-by: ChenXiaoSong chenxiaosong@kylinos.cn Signed-off-by: Steve French stfrench@microsoft.com [ Drop the parentheses clean-up since the parentheses was introduced by c8efcc786146 ("ksmbd: add support for durable handles v1/v2") in v6.9 Minor context change fixed ] Signed-off-by: Jianqi Ren jianqi.ren.cn@windriver.com Signed-off-by: He Zhe zhe.he@windriver.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/oplock.c | 2 +- fs/ksmbd/smb2pdu.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/fs/ksmbd/oplock.c +++ b/fs/ksmbd/oplock.c @@ -1498,7 +1498,7 @@ void create_lease_buf(u8 *rbuf, struct l * @open_req: buffer containing smb2 file open(create) request * @is_dir: whether leasing file is directory * - * Return: oplock state, -ENOENT if create lease context not found + * Return: allocated lease context object on success, otherwise NULL */ struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir) { --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -3230,7 +3230,7 @@ int smb2_open(struct ksmbd_work *work) goto err_out1; } } else { - if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) { + if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE && lc) { /* * Compare parent lease using parent key. If there is no * a lease that has same parent key, Send lease break