This is the mail archive of the mailing list for the glibc project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

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

We need to check the length of the string right before the strncpy call
to avoid reintroducing the compiler warning from bug 22442.

2018-11-27  Florian Weimer  <>

	[BZ #23927]
	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex): Close
	descriptor in case of ENODEV error.

diff --git a/NEWS b/NEWS
index f488821af1..1098be1afb 100644
--- a/NEWS
+++ b/NEWS
@@ -57,7 +57,9 @@ Changes to build and runtime requirements:
 Security related changes:
-  [Add security related changes here]
+  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:
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index e3d08982d9..3e999d6509 100644
--- a/sysdeps/unix/sysv/linux/if_index.c
+++ b/sysdeps/unix/sysv/linux/if_index.c
@@ -45,6 +45,7 @@ __if_nametoindex (const char *ifname)
   if (strlen (ifname) >= IFNAMSIZ)
+      __close_nocancel_nostatus (fd);
       __set_errno (ENODEV);
       return 0;

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]