[2.26 COMMITTED] CVE-2018-19591: if_nametoindex: Fix descriptor for overlong name [BZ #23927]

[Florian Weimer]

(cherry picked from commit d527c860f5a3f0ed687bd03f0cb464612dc23408)

2018-11-27  Florian Weimer  <fweimer@redhat.com>

	[BZ #23927]
	CVE-2018-19591
	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex): Avoid
	descriptor leak in case of ENODEV error.

diff --git a/NEWS b/NEWS
index 3c708d2903..f6d26425ff 100644
--- a/NEWS
+++ b/NEWS
@@ -82,6 +82,10 @@ Security related changes:
   architecture could write beyond the target buffer, resulting in a buffer
   overflow.  Reported by Andreas Schwab.
 
+  CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
+  denial of service due to resource exhaustion when processing getaddrinfo
+  calls with crafted host names.  Reported by Guido Vranken.
+
 The following bugs are resolved with this release:
 
   [16750] ldd: Never run file directly.
@@ -158,6 +162,7 @@ The following bugs are resolved with this release:
   [23562] signal: Use correct type for si_band in siginfo_t
   [23579] libc: Errors misreported in preadv2
   [23709] Fix CPU string flags for Haswell-type CPUs
+  [23927] Linux if_nametoindex() does not close descriptor (CVE-2018-19591)
 
 Version 2.26
 
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index a874634d52..b620d21936 100644
--- a/sysdeps/unix/sysv/linux/if_index.c
+++ b/sysdeps/unix/sysv/linux/if_index.c
@@ -38,11 +38,6 @@ __if_nametoindex (const char *ifname)
   return 0;
 #else
   struct ifreq ifr;
-  int fd = __opensock ();
-
-  if (fd < 0)
-    return 0;
-
   if (strlen (ifname) >= IFNAMSIZ)
     {
       __set_errno (ENODEV);
@@ -50,6 +45,12 @@ __if_nametoindex (const char *ifname)
     }
 
   strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+
+  int fd = __opensock ();
+
+  if (fd < 0)
+    return 0;
+
   if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
     {
       int saved_errno = errno;