[U-Boot] [PATCH 1/1 RESEND] NET: Fix system hanging if NET device is not installed

[Jim Lin <jilin@nvidia.com>]

If we try to boot from NET device, NetInitLoop in net.c will be invoked.
If NET device is not installed, eth_get_dev() function will return
eth_current value, which is NULL.
When NetInitLoop is called, "eth_get_dev->enetaddr" will access
restricted memory area and therefore cause hanging.
This issue is found on Tegra30 Cardhu platform after adding
CONFIG_CMD_NET and CONFIG_CMD_DHCP in config header file.

Signed-off-by: Jim Lin <jilin@nvidia.com>
---
 net/net.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/net.c b/net/net.c
index df94789..7663b9c 100644
--- a/net/net.c
+++ b/net/net.c
@@ -271,7 +271,8 @@ static void NetInitLoop(void)
 #endif
 		env_changed_id = env_id;
 	}
-	memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
+	if (eth_get_dev())
+		memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 
 	return;
 }
-- 
1.7.7