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smb/server: fix potential null-ptr-deref of lease_ctx_info in smb2_open()

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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>
This commit is contained in:
ChenXiaoSong
2024-08-22 08:20:51 +00:00
committed by Greg Kroah-Hartman
parent f27602b638
commit ec28c35029
2 changed files with 2 additions and 2 deletions
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2
fs/smb/server/oplock.c
View File

@@ -1515,7 +1515,7 @@ void create_lease_buf(u8 *rbuf, struct lease *lease)
* @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)
{

2
fs/smb/server/smb2pdu.c
View File

@@ -3243,7 +3243,7 @@ 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