Patch "ksmbd: validate request buffer size in smb2_allocate_rsp_buf()" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

to the 6.8-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-validate-request-buffer-size-in-smb2_allocate_rsp_buf.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Date: Fri, 12 Apr 2024 09:45:00 +0900
Subject: ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

From: Namjae Jeon <linkinjeon@xxxxxxxxxx>

commit 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a upstream.

The response buffer should be allocated in smb2_allocate_rsp_buf
before validating request. But the fields in payload as well as smb2 header
is used in smb2_allocate_rsp_buf(). This patch add simple buffer size
validation to avoid potencial out-of-bounds in request buffer.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/smb/server/smb2pdu.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -535,6 +535,10 @@ int smb2_allocate_rsp_buf(struct ksmbd_w
 	if (cmd == SMB2_QUERY_INFO_HE) {
 		struct smb2_query_info_req *req;
 
+		if (get_rfc1002_len(work->request_buf) <
+		    offsetof(struct smb2_query_info_req, OutputBufferLength))
+			return -EINVAL;
+
 		req = smb2_get_msg(work->request_buf);
 		if ((req->InfoType == SMB2_O_INFO_FILE &&
 		     (req->FileInfoClass == FILE_FULL_EA_INFORMATION ||


Patches currently in stable-queue which might be from linkinjeon@xxxxxxxxxx are

queue-6.8/ksmbd-clear-rename_noreplace-before-calling-vfs_rename.patch
queue-6.8/ksmbd-fix-slab-out-of-bounds-in-smb2_allocate_rsp_buf.patch
queue-6.8/ksmbd-common-use-struct_group_attr-instead-of-struct_group-for-network_open_info.patch
queue-6.8/ksmbd-validate-request-buffer-size-in-smb2_allocate_rsp_buf.patch




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