From: Florian Weimer <fweimer@redhat.com>
Date: Tue, 27 Nov 2018 15:12:43 +0000 (+0100)
Subject: CVE-2018-19591: if_nametoindex: Fix descriptor for overlong name [BZ #23927]
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f433fc791ca4f9d678903ff45b504b524c886fb;p=thirdparty%2Fglibc.git

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

(cherry picked from commit d527c860f5a3f0ed687bd03f0cb464612dc23408)
---

diff --git a/ChangeLog b/ChangeLog
index f150dbd39ca..2f1e82b61c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+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.
+
 2018-11-08  Alexandra Hájková  <ahajkova@redhat.com>
 
 	[BZ #17630]
diff --git a/NEWS b/NEWS
index 5fef60bc0f0..e1a23f076b5 100644
--- a/NEWS
+++ b/NEWS
@@ -37,6 +37,10 @@ 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:
 
   [6889] 'PWD' mentioned but not specified
@@ -97,6 +101,7 @@ The following bugs are resolved with this release:
   [23709] Fix CPU string flags for Haswell-type CPUs
   [23821] si_band in siginfo_t has wrong type long int on sparc64
   [23822] ia64 static libm.a is missing exp2f, log2f and powf symbols
+  [23927] Linux if_nametoindex() does not close descriptor (CVE-2018-19591)
 
 
 Version 2.27
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index e3d08982d99..782fc5e1750 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;