net: hsr: align sup_multicast_addr in struct hsr_priv to u16 boundary

sup_multicast_addr is passed to ether_addr_equal for address comparison
which casts the address inputs to u16 leading to an unaligned access.
Aligning the sup_multicast_addr to u16 boundary fixes the issue.

Signed-off-by: Andreas Oetken <andreas.oetken@siemens.com>
Link: https://lore.kernel.org/r/20210202090304.2740471-1-ennoerlangen@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Andreas Oetken

net/hsr/hsr_main.h

@@ -217,7 +217,10 @@ struct hsr_priv {
 	u8 net_id;		/* for PRP, it occupies most significant 3 bits
 				 * of lan_id
 				 */
-	unsigned char		sup_multicast_addr[ETH_ALEN];
+	unsigned char		sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
+				/* Align to u16 boundary to avoid unaligned access
+				 * in ether_addr_equal
+				 */
 #ifdef	CONFIG_DEBUG_FS
 	struct dentry *node_tbl_root;
 #endif