From: Adrian Dabrowski <atrox-qE3U7d0pukyEhLc4KmoMIOTv7YV0F9Eg@public.gmane.org>
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: getifaddrs()
Date: Thu, 05 Jul 2012 23:33:06 +0200 [thread overview]
Message-ID: <4FF60812.70408@seclab.tuwien.ac.at> (raw)
Version: manpages-dev 3.27-1ubuntu2
The example program source produces a Seg-Fault, when a device does not
have an ifa->ifa_addr. (e.g. openvpn-tunnels, probably others (dialup?))
ORIGINAL:
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
family = ifa->ifa_addr->sa_family;
POSSIBLE FIX:
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr != NULL)
family = ifa->ifa_addr->sa_family;
else
family = -1;
Also it is not documented, that struct sockaddr *ifa_addr might be NULL.
best wishes and keep up the good work,
Adrian Dabrowski
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next reply other threads:[~2012-07-05 21:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-05 21:33 Adrian Dabrowski [this message]
[not found] ` <4FF60812.70408-qE3U7d0pukyEhLc4KmoMIOTv7YV0F9Eg@public.gmane.org>
2012-07-06 19:29 ` getifaddrs() Simon Paillard
[not found] ` <20120706192945.GA15283-8MNqHwMchPhGJ/Ie3qa20WD2FQJk+8+b@public.gmane.org>
2012-07-07 6:20 ` getifaddrs() Michael Kerrisk (man-pages)
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