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[hurd,commited] hurd: Make __if_nametoindex return ENODEV if ifname is too long
- From: Samuel Thibault <samuel dot thibault at ens-lyon dot org>
- To: libc-alpha at sourceware dot org
- Cc: Samuel Thibault <samuel dot thibault at ens-lyon dot org>
- Date: Tue, 3 Apr 2018 23:14:58 +0200
- Subject: [hurd,commited] hurd: Make __if_nametoindex return ENODEV if ifname is too long
rather than truncating it.
* sysdeps/mach/hurd/if_index.c (__if_nametoindex): Return ENODEV if
ifname is too long.
---
ChangeLog | 4 ++--
sysdeps/mach/hurd/if_index.c | 8 ++++++--
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index dd78bf691a..cc9613239d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -35,8 +35,8 @@
2018-04-03 Samuel Thibault <samuel.thibault@ens-lyon.org>
- * sysdeps/mach/hurd/if_index.c (__if_nametoindex): Always end
- ifr.fr_name with a NUL caracter.
+ * sysdeps/mach/hurd/if_index.c (__if_nametoindex): Return ENODEV if
+ ifname is too long.
2018-04-03 Wilco Dijkstra <wdijkstr@arm.com>
diff --git a/sysdeps/mach/hurd/if_index.c b/sysdeps/mach/hurd/if_index.c
index 7f647b7036..b56bfc7ecd 100644
--- a/sysdeps/mach/hurd/if_index.c
+++ b/sysdeps/mach/hurd/if_index.c
@@ -37,9 +37,13 @@ __if_nametoindex (const char *ifname)
if (fd < 0)
return 0;
- strncpy (ifr.ifr_name, ifname, IFNAMSIZ - 1);
- ifr.ifr_name[IFNAMESIZ - 1] = '\0';
+ if (strlen (ifname) >= IFNAMSIZ)
+ {
+ __set_errno (ENODEV);
+ return 0;
+ }
+ strncpy (ifr.ifr_name, ifname, IFNAMESIZ - 1);
if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
{
int saved_errno = errno;
--
2.16.2