ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

[ Upstream commit 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a ]

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@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/ksmbd/smb2pdu.c

@@ -536,6 +536,10 @@ int smb2_allocate_rsp_buf(struct ksmbd_work *work)
 	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 ||