mei: bus: block send with vtag on non-conformat FW

Block data send with vtag if either transport layer or
FW client are not supporting vtags.

Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20210208150649.141358-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/bus.c

@@ -61,6 +61,13 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
 		goto out;
 	}
 
+	if (vtag) {
+		/* Check if vtag is supported by client */
+		rets = mei_cl_vt_support_check(cl);
+		if (rets)
+			goto out;
+	}
+
 	if (length > mei_cl_mtu(cl)) {
 		rets = -EFBIG;
 		goto out;