Commit e7b8b8ed authored by Gustav Johansson's avatar Gustav Johansson Committed by Steve French
Browse files

ksmbd: smb2: Allow messages padded to 8byte boundary 



clc length is now accepted to <= 8 less than length,
rather than < 8.

Solve issues on some of Axis's smb clients which send
messages where clc length is 8 bytes less than length.

The specific client was running kernel 4.19.217 with
smb dialect 3.0.2 on armv7l.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarGustav Johansson <gustajo@axis.com>
Acked-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 443d61d1

fs/ksmbd/smb2misc.c

+4 −1
Original line number Diff line number Diff line
@@ -416,8 +416,11 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work) 


		/*

		 * Allow a message that padded to 8byte boundary.

		 * Linux 4.19.217 with smb 3.0.2 are sometimes

		 * sending messages where the cls_len is exactly

		 * 8 bytes less than len.

		 */

		if (clc_len < len && (len - clc_len) < 8)

		if (clc_len < len && (len - clc_len) <= 8)

			goto validate_credit;



		pr_err_ratelimited(