From a7b872687073decdcc7effc2289877d69058aca9 Mon Sep 17 00:00:00 2001 From: Andreas Schwab Date: Sat, 13 Sep 2014 10:10:29 +0200 Subject: Handle zero prefix length in getifaddrs (BZ #17371) --- sysdeps/unix/sysv/linux/ifaddrs.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) (limited to 'sysdeps/unix') diff --git a/sysdeps/unix/sysv/linux/ifaddrs.c b/sysdeps/unix/sysv/linux/ifaddrs.c index 2c04e172ce..a47b2edcad 100644 --- a/sysdeps/unix/sysv/linux/ifaddrs.c +++ b/sysdeps/unix/sysv/linux/ifaddrs.c @@ -770,20 +770,17 @@ getifaddrs_internal (struct ifaddrs **ifap) if (cp != NULL) { - char c; unsigned int preflen; - if ((max_prefixlen > 0) && - (ifam->ifa_prefixlen > max_prefixlen)) + if (ifam->ifa_prefixlen > max_prefixlen) preflen = max_prefixlen; else preflen = ifam->ifa_prefixlen; - for (i = 0; i < ((preflen - 1) / 8); i++) + for (i = 0; i < preflen / 8; i++) *cp++ = 0xff; - c = 0xff; - c <<= ((128 - preflen) % 8); - *cp = c; + if (preflen % 8) + *cp = 0xff << (8 - preflen % 8); } } } -- cgit v1.2.3