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

FAILED: patch "[PATCH] ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read" 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 fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024121056-come-ultimatum-bead@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 Mon Sep 17 00:00:00 2001
From: Jordy Zomer <jordyzomer@google.com>
Date: Thu, 28 Nov 2024 09:32:45 +0900
Subject: [PATCH] ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read

An offset from client could be a negative value, It could lead
to an out-of-bounds read from the stream_buf.
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 416f7df4edef..7b6a3952f228 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -6663,6 +6663,10 @@ int smb2_read(struct ksmbd_work *work)
 	}
 
 	offset = le64_to_cpu(req->Offset);
+	if (offset < 0) {
+		err = -EINVAL;
+		goto out;
+	}
 	length = le32_to_cpu(req->Length);
 	mincount = le32_to_cpu(req->MinimumCount);