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authorBenoît Ganne <bganne@cisco.com>2019-07-19 13:42:12 +0200
committerOle Trøan <otroan@employees.org>2019-09-26 16:34:56 +0000
commit2d0ebd7ebc555565868038a09d80a61f5de29430 (patch)
treec1d937ec41728ff611691e78cd70905c0731b1e9 /src/vnet/ip/reass/ip6_full_reass.c
parenta025b3ea353b5c5c356efda0888d75a2ab8979e0 (diff)
ip: fix use-after-free in reassembly
- ip{4,6}_reass_finalize() frees the reassembly context: do not access it after the call. - traces access reassembly context: free it after and not before tracing. Type: fix Change-Id: Ia3aaea9c7b74932e249e013be04b9bd7298fd187 Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/vnet/ip/reass/ip6_full_reass.c')
-rw-r--r--src/vnet/ip/reass/ip6_full_reass.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/src/vnet/ip/reass/ip6_full_reass.c b/src/vnet/ip/reass/ip6_full_reass.c
index 0b41dea5a87..92fab60d337 100644
--- a/src/vnet/ip/reass/ip6_full_reass.c
+++ b/src/vnet/ip/reass/ip6_full_reass.c
@@ -885,13 +885,13 @@ ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
else
{
// overlapping fragment - not allowed by RFC 8200
- ip6_full_reass_drop_all (vm, node, rm, reass);
- ip6_full_reass_free (rm, rt, reass);
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, rm, reass, *bi0,
RANGE_OVERLAP, ~0);
}
+ ip6_full_reass_drop_all (vm, node, rm, reass);
+ ip6_full_reass_free (rm, rt, reass);
*next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
*error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
return IP6_FULL_REASS_RC_OK;
@@ -911,11 +911,12 @@ check_if_done_maybe:
reass->data_len == reass->last_packet_octet + 1)
{
*handoff_thread_idx = reass->sendout_thread_index;
+ int handoff =
+ reass->memory_owner_thread_index != reass->sendout_thread_index;
ip6_full_reass_rc_t rc =
ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
is_custom_app);
- if (IP6_FULL_REASS_RC_OK == rc
- && reass->memory_owner_thread_index != reass->sendout_thread_index)
+ if (IP6_FULL_REASS_RC_OK == rc && handoff)
{
return IP6_FULL_REASS_RC_HANDOFF;
}