diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/if_index.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/if_index.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c index 8ba5eae781..b620d21936 100644 --- a/sysdeps/unix/sysv/linux/if_index.c +++ b/sysdeps/unix/sysv/linux/if_index.c @@ -38,12 +38,19 @@ __if_nametoindex (const char *ifname) return 0; #else struct ifreq ifr; + if (strlen (ifname) >= IFNAMSIZ) + { + __set_errno (ENODEV); + return 0; + } + + strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); + int fd = __opensock (); if (fd < 0) return 0; - strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0) { int saved_errno = errno; |