From d1c457badfce0dc86b54b2cac2c5eec99d7bc65e Mon Sep 17 00:00:00 2001 From: Tom Gundersen Date: Sat, 13 Sep 2014 20:41:35 +0200 Subject: [PATCH] resolved: fall back to hardcoded ifindex when checking if a link is the loopback Reported by Philippe De Swert . Coverity CID#1237656 --- src/resolve/resolved-manager.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c index f97989754..00aaffe44 100644 --- a/src/resolve/resolved-manager.c +++ b/src/resolve/resolved-manager.c @@ -1687,6 +1687,9 @@ fail: return r; } +/* lo having ifindex 1 is hardcoded in the kernel */ +#define LOOPBACK_IFINDEX 1 + int manager_ifindex_is_loopback(Manager *m, int ifindex) { Link *l; assert(m); @@ -1695,7 +1698,10 @@ int manager_ifindex_is_loopback(Manager *m, int ifindex) { return -EINVAL; l = hashmap_get(m->links, INT_TO_PTR(ifindex)); - if (l->flags & IFF_LOOPBACK) + if (!l) + /* in case we don't yet track the link, rely on the hardcoded value */ + return ifindex == LOOPBACK_IFINDEX; + else if (l->flags & IFF_LOOPBACK) return 1; return 0; -- 2.30.2