diff options
| author |   Klement Sekera <ksekera@cisco.com> | 2020-06-24 13:13:46 +0000 |
|---|---|---|
| committer |   Andrew Yourtchenko <ayourtch@gmail.com> | 2020-08-18 19:47:21 +0000 |
| commit | 4784b2a696acce9fb0713b7783048272812138b5 (patch) | |
| tree | 5147ab10fbd22e874374524489981fc08bd9e28d | |
| parent | bef1019aa30a93c4eb4ca7da48651c920609b23c (diff) | |
nat: avoid division by zero
Return error instead of dividing by zero.
Type: fix
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I9f6a942e87ab87e8f1921e744ec1add45884e74a
(cherry picked from commit fe77bdc1906cca6a76bd44b1aceffc971f64cec4)
| -rw-r--r-- | src/plugins/nat/nat_det.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/plugins/nat/nat_det.c b/src/plugins/nat/nat_det.c index cad0d2ae5af..65a669bceb9 100644 --- a/src/plugins/nat/nat_det.c +++ b/src/plugins/nat/nat_det.c @@ -82,13 +82,20 @@ snat_det_add_map (snat_main_t * sm, ip4_address_t * in_addr, u8 in_plen, num_sessions = num_sessions * 1000 - 1; } + u32 sharing_ratio = (1 << (32 - in_plen)) / (1 << (32 - out_plen)); + if (!sharing_ratio) + { + // avoid division by zero + return VNET_API_ERROR_INVALID_VALUE; + } + pool_get (sm->det_maps, det_map); clib_memset (det_map, 0, sizeof (*det_map)); det_map->in_addr.as_u32 = in_cmp.as_u32; det_map->in_plen = in_plen; det_map->out_addr.as_u32 = out_cmp.as_u32; det_map->out_plen = out_plen; - det_map->sharing_ratio = (1 << (32 - in_plen)) / (1 << (32 - out_plen)); + det_map->sharing_ratio = sharing_ratio; det_map->ports_per_host = (65535 - 1023) / det_map->sharing_ratio; vec_validate_init_empty (det_map->sessions, num_sessions, |