ip: crash in ip4_sas_commonlen
ip4_sas_commonlen may be called with null a2 argument from
ip4_neighbor_advertise -> ip4_sas_by_sw_if_index.
If a1 or a2 is null, there is no common length, shortest mask
between a1 and a2, return 0 instead of crashing.
Type: fix
Change-Id: I307509ee7dedafac76d8877a1ef76ab8bbafef59
Signed-off-by: Steven Luong <sluong@cisco.com>
diff --git a/src/vnet/ip/ip_sas.c b/src/vnet/ip/ip_sas.c
index 0fc2617..01f6c90 100644
--- a/src/vnet/ip/ip_sas.c
+++ b/src/vnet/ip/ip_sas.c
@@ -54,6 +54,8 @@
static int
ip4_sas_commonlen (const ip4_address_t *a1, const ip4_address_t *a2)
{
+ if (!a1 || !a2)
+ return 0;
u64 a =
clib_net_to_host_u32 (a1->as_u32) ^ clib_net_to_host_u32 (a2->as_u32);
if (a == 0)