From bdaeb8f23c6d5d11829072baaf0c0fe37c09f26a Mon Sep 17 00:00:00 2001
From: Michal Simek <michal.simek@xilinx.com>
Date: Mon, 19 Oct 2015 15:13:34 +0200
Subject: common: mii: Do not allow to exceed max phy limit

Phy can have addresses 0-31. Check this boundary to ensure that user
can't call commands on phy address 32 and more.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/common/cmd_mii.c b/common/cmd_mii.c
index 5e9079d..7ef7532 100644
--- a/common/cmd_mii.c
+++ b/common/cmd_mii.c
@@ -314,6 +314,11 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			mask = simple_strtoul(argv[5], NULL, 16);
 	}
 
+	if (addrhi > 31) {
+		printf("Incorrect PHY address. Range should be 0-31\n");
+		return CMD_RET_USAGE;
+	}
+
 	/* use current device */
 	devname = miiphy_get_current_dev();
 
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