From: tw19881113@gmail.com <tw19881113@gmail.com>
Date: Wed, 30 Dec 2015 07:24:43 +0000 (+0800)
Subject: fix buffer overflow in ifaddrs.c
X-Git-Tag: lxc-2.0.0.beta2~76^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F743%2Fhead;p=thirdparty%2Flxc.git

fix buffer overflow in ifaddrs.c

jenkins: ok to test

Signed-off-by: Tw <tw19881113@gmail.com>
---

diff --git a/src/include/ifaddrs.c b/src/include/ifaddrs.c
index 109f32297..1f954dd7d 100644
--- a/src/include/ifaddrs.c
+++ b/src/include/ifaddrs.c
@@ -473,7 +473,9 @@ static void interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, stru
         {
             l_mask[i] = 0xff;
         }
-        l_mask[i] = 0xff << (8 - (l_prefix % 8));
+        if (l_prefix % 8) {
+            l_mask[i] = 0xff << (8 - (l_prefix % 8));
+        }
 
         makeSockaddr(l_entry->ifa_addr->sa_family, (struct sockaddr *)l_addr, l_mask, l_maxPrefix / 8);
         l_entry->ifa_netmask = (struct sockaddr *)l_addr;