[PATCH 5.15.y 01/11] ksmbd: validate the zero field of packet header

Namjae Jeon
2024-01-21T14:31:03Z

From: Li Nan <linan122@huawei.com>

[ Upstream commit 516b3eb8c8065f7465f87608d37a7ed08298c7a5 ]

The SMB2 Protocol requires that "The first byte of the Direct TCP
transport packet header MUST be zero (0x00)"[1]. Commit 1c1bcf2d3ea0
("ksmbd: validate smb request protocol id") removed the validation of
this 1-byte zero. Add the validation back now.

[1]: [MS-SMB2] - v20230227, page 30.
https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SMB2/%5bMS-SMB2%5d-230227.pdf

Fixes: 1c1bcf2d3ea0 ("ksmbd: validate smb request protocol id")
Signed-off-by: Li Nan <linan122@huawei.com>
Acked-by: Tom Talpey <tom@talpey.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/ksmbd/smb_common.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index d160363c09eb..e90a1e8c1951 100644
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -158,8 +158,12 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work)
*/
bool ksmbd_smb_request(struct ksmbd_conn *conn)
{
- __le32 *proto = (__le32 *)smb2_get_msg(conn->request_buf);
+ __le32 *proto;

+ if (conn->request_buf[0] != 0)
+ return false;
+
+ proto = (__le32 *)smb2_get_msg(conn->request_buf);
if (*proto == SMB2_COMPRESSION_TRANSFORM_ID) {
pr_err_ratelimited("smb2 compression not support yet");
return false;
--
2.25.1