From 2180fee114b778515b3f560e5ff1e795282e60b0 Mon Sep 17 00:00:00 2001
From: Steve Ellcey <sellcey@caviumnetworks.com>
Date: Wed, 15 Nov 2017 08:58:48 -0800
Subject: [PATCH] Check length of ifname before copying it into to ifreq
 structure.

	[BZ #22442]
	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex):
	Check if ifname is too long.
---
 ChangeLog                          | 6 ++++++
 sysdeps/unix/sysv/linux/if_index.c | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index c26eac8d32..e10db6016d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-11-15  Steve Ellcey  <sellcey@cavium.com>
+
+	[BZ #22442]
+	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex):
+	Check if ifname is too long.
+
 2017-11-15  Luke Shumaker  <lukeshu@parabola.nu>
 
 	* sysdeps/unix/sysv/linux/epoll_wait.c: Include <sysdep-cancel.h>.
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index 56f3f136cb..e7ca27bc18 100644
--- a/sysdeps/unix/sysv/linux/if_index.c
+++ b/sysdeps/unix/sysv/linux/if_index.c
@@ -43,6 +43,12 @@ __if_nametoindex (const char *ifname)
   if (fd < 0)
     return 0;
 
+  if (strlen (ifname) >= IFNAMSIZ)
+    {
+      __set_errno (ENODEV);
+      return 0;
+    }
+
   strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
   if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
     {
-- 
2.11.4.GIT