[U-Boot-Users] [PATCH 1/2] cmd_mii.c: Fix a NULL pointer dereference

[Shinya Kuribayashi]

Issuing `mii' command with no arguments causes NULL pointer dereference as
parse_line() assignes NULL to argv[1] in such case. Make sure `argc' >= 2
before referencing argv[1], or print the usage message.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi at necel.com>
Signed-off-by: Andrew Dyer <amdyer at gmail.com>
---

 common/cmd_mii.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/common/cmd_mii.c b/common/cmd_mii.c
index b771322..b99bd06 100644
--- 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