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zebra: Remove possible NULL dereference in if_delete_connected

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It is technically possible to attempt to use a NULL pointer.
Remove this from happening.

Additionally cleanup code indentation a small bit.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2017-12-13 10:32:54 -05:00
parent 9b7e34ec42
commit 070b4959fa
1 changed files with 36 additions and 35 deletions
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71
zebra/interface.c
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@ -561,33 +561,35 @@ static void if_delete_connected(struct interface *ifp)
struct prefix cp; struct prefix cp;
struct route_node *rn; struct route_node *rn;
struct zebra_if *zebra_if; struct zebra_if *zebra_if;
struct listnode *node;
struct listnode *last = NULL;
zebra_if = ifp->info; zebra_if = ifp->info;
if (ifp->connected) { if (!ifp->connected)
struct listnode *node; return;
struct listnode *last = NULL;
while ((node = (last ? last->next while ((node = (last ? last->next
: listhead(ifp->connected)))) { : listhead(ifp->connected)))) {
ifc = listgetdata(node); ifc = listgetdata(node);
cp = *CONNECTED_PREFIX(ifc); cp = *CONNECTED_PREFIX(ifc);
apply_mask(&cp); apply_mask(&cp);
if (cp.family == AF_INET if (cp.family == AF_INET
&& (rn = route_node_lookup(zebra_if->ipv4_subnets, && (rn = route_node_lookup(zebra_if->ipv4_subnets,
&cp))) { &cp))) {
struct listnode *anode; struct listnode *anode;
struct listnode *next; struct listnode *next;
struct listnode *first; struct listnode *first;
struct list *addr_list; struct list *addr_list;
route_unlock_node(rn); route_unlock_node(rn);
addr_list = (struct list *)rn->info; addr_list = (struct list *)rn->info;
/* Remove addresses, secondaries first. */ /* Remove addresses, secondaries first. */
first = listhead(addr_list); first = listhead(addr_list);
if (first)
for (anode = first->next; anode || first; for (anode = first->next; anode || first;
anode = next) { anode = next) {
if (!anode) { if (!anode) {
@ -626,27 +628,26 @@ static void if_delete_connected(struct interface *ifp)
last = node; last = node;
} }
/* Free chain list and respective route node. */ /* Free chain list and respective route node. */
list_delete_and_null(&addr_list); list_delete_and_null(&addr_list);
rn->info = NULL; rn->info = NULL;
route_unlock_node(rn); route_unlock_node(rn);
} else if (cp.family == AF_INET6) { } else if (cp.family == AF_INET6) {
connected_down(ifp, ifc); connected_down(ifp, ifc);
zebra_interface_address_delete_update(ifp, ifc); zebra_interface_address_delete_update(ifp, ifc);
UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL); UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED); UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED))
last = node;
else {
listnode_delete(ifp->connected, ifc);
connected_free(ifc);
}
} else {
last = node; last = node;
else {
listnode_delete(ifp->connected, ifc);
connected_free(ifc);
} }
} else {
last = node;
} }
} }
} }