interface-ip: Fix possbile segfaults

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

diff --git a/interface-ip.c b/interface-ip.c
index 919c8cc83f9bf7a830e6540807ecbf1b8df93139..eb585f566dad962e4348d65d2fd2dff7931a58ad 100644 (file)
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -366,7 +366,7 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
                const char *mask = strtok_r(NULL, "/", &saveptr);
 
                if (!addr || inet_pton(af, addr, &route->source) < 1) {
-                       DPRINTF("Failed to parse route source: %s\n", addr);
+                       DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
                        goto error;
                }
 
@@ -857,6 +857,9 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
 
        // End-of-assignment sentinel
        c = malloc(sizeof(*c) + 1);
+       if (!c)
+               return;
+
        c->assigned = 1 << (64 - prefix->length);
        c->length = 64;
        c->name[0] = 0;
@@ -867,12 +870,14 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
        if (prefix->excl_length > 0) {
                const char name[] = "!excluded";
                c = malloc(sizeof(*c) + sizeof(name));
-               c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
-                               ((1 << (64 - prefix->length)) - 1);
-               c->length = prefix->excl_length;
-               c->addr = in6addr_any;
-               memcpy(c->name, name, sizeof(name));
-               list_add(&c->head, &prefix->assignments);
+               if (c) {
+                       c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
+                                       ((1 << (64 - prefix->length)) - 1);
+                       c->length = prefix->excl_length;
+                       c->addr = in6addr_any;
+                       memcpy(c->name, name, sizeof(name));
+                       list_add(&c->head, &prefix->assignments);
+               }
        }
 
        bool assigned_any = false;
@@ -900,6 +905,9 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
 
                size_t namelen = strlen(iface->name) + 1;
                c = malloc(sizeof(*c) + namelen);
+               if (!c)
+                       continue;
+
                c->length = iface->assignment_length;
                c->assigned = iface->assignment_hint;
                c->addr = in6addr_any;
@@ -1033,6 +1041,9 @@ interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
                pclass = (iface) ? iface->name : "local";
 
        struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
+       if (!prefix)
+               return NULL;
+
        prefix->length = length;
        prefix->addr = *addr;
        prefix->preferred_until = preferred_until;