From: Sven Eckelmann <sven@narfation.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: [B.A.T.M.A.N.] [PATCH] alfred: Avoid buffer overflow while querying ARP cache
Date: Fri, 27 Jan 2017 15:10:44 +0100 [thread overview]
Message-ID: <20170127141044.5317-1-sven@narfation.org> (raw)
The arpreq.arp_dev is a limited buffer (16 bytes). Avoid that more bytes
from the interface name are copied into this buffer by switching from
strcpy to strncpy.
Fixes: c7da798113a2 ("alfred: IPv4 multicast distribution support.")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
util.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/util.c b/util.c
index 84ab3af..ed83895 100644
--- a/util.c
+++ b/util.c
@@ -92,7 +92,9 @@ int ipv4_arp_request(struct interface *interface, const alfred_addr *addr,
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr->ipv4.s_addr;
- strcpy(arpreq.arp_dev, interface->interface);
+ strncpy(arpreq.arp_dev, interface->interface, sizeof(arpreq.arp_dev));
+ arpreq.arp_dev[sizeof(arpreq.arp_dev) - 1] = '\0';
+
if (ioctl(interface->netsock, SIOCGARP, &arpreq) < 0)
return -1;
--
2.11.0
next reply other threads:[~2017-01-27 14:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-27 14:10 Sven Eckelmann [this message]
2017-01-27 14:34 ` [B.A.T.M.A.N.] [PATCH] alfred: Avoid buffer overflow while querying ARP cache Antonio Quartulli
2017-01-27 20:08 ` Sven Eckelmann
2017-01-30 8:29 ` Simon Wunderlich
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