bridge: mrp: Fix out-of-bounds read in br_mrp_parse

The issue was reported by syzbot. When the function br_mrp_parse was
called with a valid net_bridge_port, the net_bridge was an invalid
pointer. Therefore the check br->stp_enabled could pass/fail
depending where it was pointing in memory.
The fix consists of setting the net_bridge pointer if the port is a
valid pointer.

Reported-by: syzbot+9c6f0f1f8e32223df9a4@syzkaller.appspotmail.com
Fixes: 65369933 ("bridge: mrp: Integrate MRP into the bridge")
Signed-off-by: NHoratiu Vultur <horatiu.vultur@microchip.com>
Acked-by: NNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_mrp_netlink.c

@@ -27,6 +27,12 @@ int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
 	struct nlattr *tb[IFLA_BRIDGE_MRP_MAX + 1];
 	int err;
 
+	/* When this function is called for a port then the br pointer is
+	 * invalid, therefor set the br to point correctly
+	 */
+	if (p)
+		br = p->br;
+
 	if (br->stp_enabled != BR_NO_STP) {
 		NL_SET_ERR_MSG_MOD(extack, "MRP can't be enabled if STP is already enabled");
 		return -EINVAL;