FAILED: patch "[PATCH] ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 313dab082289e460391c82d855430ec8a28ddf81
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024121007-alongside-neuter-46d3@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 313dab082289e460391c82d855430ec8a28ddf81 Mon Sep 17 00:00:00 2001
From: Jordy Zomer <jordyzomer@google.com>
Date: Thu, 28 Nov 2024 09:33:25 +0900
Subject: [PATCH] ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write

An offset from client could be a negative value, It could allows
to write data outside the bounds of the allocated buffer.
Note that this issue is coming when setting
'vfs objects = streams_xattr parameter' in ksmbd.conf.

Cc: stable@vger.kernel.org # v5.15+
Reported-by: Jordy Zomer <jordyzomer@google.com>
Signed-off-by: Jordy Zomer <jordyzomer@google.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 7b6a3952f228..23879555880f 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -6882,6 +6882,8 @@ int smb2_write(struct ksmbd_work *work)
 	}
 
 	offset = le64_to_cpu(req->Offset);
+	if (offset < 0)
+		return -EINVAL;
 	length = le32_to_cpu(req->Length);
 
 	if (req->Channel == SMB2_CHANNEL_RDMA_V1 ||