common/cmd_mii.c: Add sanity argc check

If type mii command without arguments, we suffer from uninitialized argv[]
entries; for example we MIPS get stuck by TLB error.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>

diff --git a/common/cmd_mii.c b/common/cmd_mii.c
index f530a38..079612a 100644 (file)
--- a/common/cmd_mii.c
+++ b/common/cmd_mii.c
@@ -438,6 +438,11 @@ int do_mii (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
        int             rcode = 0;
        char            *devname;
 
+       if (argc < 2) {
+               printf("Usage:\n%s\n", cmdtp->usage);
+               return 1;
+       }
+
 #if defined(CONFIG_8xx) || defined(CONFIG_MCF532x)
        mii_init ();
 #endif