This is a note to let you know that I've just added the patch titled
ksmbd: smb2: Allow messages padded to 8byte boundary
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ksmbd-smb2-allow-messages-padded-to-8byte-boundary.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e7b8b8ed9960bf699bf4029f482d9e869c094ed6 Mon Sep 17 00:00:00 2001
From: Gustav Johansson <gustajo@xxxxxxxx>
Date: Sat, 6 May 2023 00:05:07 +0900
Subject: ksmbd: smb2: Allow messages padded to 8byte boundary
From: Gustav Johansson <gustajo@xxxxxxxx>
commit e7b8b8ed9960bf699bf4029f482d9e869c094ed6 upstream.
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@xxxxxxxxxxxxxxx
Signed-off-by: Gustav Johansson <gustajo@xxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ksmbd/smb2misc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -422,8 +422,11 @@ int ksmbd_smb2_check_message(struct ksmb
/*
* 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(
Patches currently in stable-queue which might be from gustajo@xxxxxxxx are
queue-5.15/ksmbd-smb2-allow-messages-padded-to-8byte-boundary.patch
