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 ||