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ipsec: fix use-after-free

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When deleting interface from the API, 'hi' gets removed before
'h->sw_if_index' is copied.

Type: fix

Change-Id: I8e10108e9bdf95ab2fe002790d98262d583ca58c
Signed-off-by: Benoît Ganne <bganne@cisco.com>
(cherry picked from commit 8133c780a22480496c74a4ead321e8350d5beeb4)
This commit is contained in:
Benoît Ganne
2019-09-09 16:34:54 +02:00
committed by Andrew Yourtchenko
parent c385270341
commit 07228c09a6
1 changed files with 7 additions and 3 deletions
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10
src/vnet/ipsec/ipsec_if.c
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@ -268,12 +268,13 @@ ipsec_tunnel_feature_set (ipsec_main_t * im, ipsec_tunnel_if_t * t, u8 enable)
int
ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
ipsec_add_del_tunnel_args_t * args,
u32 * sw_if_index)
u32 * sw_if_index_p)
{
ipsec_tunnel_if_t *t;
ipsec_main_t *im = &ipsec_main;
vnet_hw_interface_t *hi = NULL;
u32 hw_if_index = ~0;
u32 sw_if_index = ~0;
uword *p;
u32 dev_instance;
ipsec_key_t crypto_key, integ_key;
@ -385,6 +386,7 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
t - im->tunnel_interfaces);
hi = vnet_get_hw_interface (vnm, hw_if_index);
sw_if_index = hi->sw_if_index;
t->hw_if_index = hw_if_index;
t->sw_if_index = hi->sw_if_index;
@ -420,6 +422,8 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
ti = p[0];
t = pool_elt_at_index (im->tunnel_interfaces, ti);
hi = vnet_get_hw_interface (vnm, t->hw_if_index);
sw_if_index = hi->sw_if_index;
vnet_sw_interface_set_flags (vnm, hi->sw_if_index, 0); /* admin down */
ipsec_tunnel_feature_set (im, t, 0);
@ -440,8 +444,8 @@ ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
pool_put (im->tunnel_interfaces, t);
}
if (sw_if_index)
*sw_if_index = hi->sw_if_index;
if (sw_if_index_p)
*sw_if_index_p = sw_if_index;
return 0;
}