From: Jim Lin <jilin@nvidia.com>
Date: Fri, 17 May 2013 09:41:03 +0000 (+0800)
Subject: NET: Fix system hanging if NET device is not installed
X-Git-Tag: submit/tizen/20160318.071304~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f4d884a8ead99046f7b8b2b54e441c9c07f76169;p=profile%2Fcommon%2Fplatform%2Fkernel%2Fu-boot-artik.git

NET: Fix system hanging if NET device is not installed

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.

Change-Id: I8bf18901842043f33a06c96ab5201c406fe0f605
Signed-off-by: Jim Lin <jilin@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Jae-young Hwang <j-zero.hwang@samsung.com>
---

diff --git a/net/net.c b/net/net.c
index e8ff0662b..ea8ac4772 100644
--- a/net/net.c
+++ b/net/net.c
@@ -256,7 +256,8 @@ 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;
 }