From: Thierry Reding <treding@nvidia.com>
Date: Tue, 16 Aug 2016 14:45:38 +0000 (+0200)
Subject: net: ipconfig: Fix more use after free
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d2d371ae5dd6af9a6a3d7f50b753627c42868409;p=deliverable%2Flinux.git

net: ipconfig: Fix more use after free

While commit 9c706a49d660 ("net: ipconfig: fix use after free") avoids
the use after free, the resulting code still ends up calling both the
ic_setup_if() and ic_setup_routes() after calling ic_close_devs(), and
access to the device is still required.

Move the call to ic_close_devs() to the very end of the function.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 66c2fe602810..ba9cbeafbb2e 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1530,12 +1530,14 @@ static int __init ip_auto_config(void)
 	 * Close all network devices except the device we've
 	 * autoconfigured and set up routes.
 	 */
-	ic_close_devs();
 	if (ic_setup_if() < 0 || ic_setup_routes() < 0)
-		return -1;
+		err = -1;
+	else
+		err = 0;
 
+	ic_close_devs();
 
-	return 0;
+	return err;
 }
 
 late_initcall(ip_auto_config);