diff options
| author |   Benoît Ganne <bganne@cisco.com> | 2019-07-19 13:42:12 +0200 |
|---|---|---|
| committer |   Andrew Yourtchenko <ayourtch@gmail.com> | 2019-10-03 16:14:36 +0000 |
| commit | f2c754caa90e8f16aa545cac99ead4bf4437aa44 (patch) | |
| tree | 9d301c65c16681fdb59a1f4b7682974e610bfc17 | |
| parent | bebbd7f62d7f1c0286747d75e11d84bd9d792698 (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>
(cherry picked from commit 2d0ebd7ebc555565868038a09d80a61f5de29430)
| -rw-r--r-- | src/vnet/ip/reass/ip4_full_reass.c | 5 | ||||
| -rw-r--r-- | src/vnet/ip/reass/ip6_full_reass.c | 9 |
2 files changed, 8 insertions, 6 deletions
diff --git a/src/vnet/ip/reass/ip4_full_reass.c b/src/vnet/ip/reass/ip4_full_reass.c index 7cf4f43b0a8..73e820f5427 100644 --- a/src/vnet/ip/reass/ip4_full_reass.c +++ b/src/vnet/ip/reass/ip4_full_reass.c @@ -1040,11 +1040,12 @@ ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, 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; rc = ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, is_custom_app); - if (IP4_REASS_RC_OK == rc - && reass->memory_owner_thread_index != reass->sendout_thread_index) + if (IP4_REASS_RC_OK == rc && handoff) { rc = IP4_REASS_RC_HANDOFF; } diff --git a/src/vnet/ip/reass/ip6_full_reass.c b/src/vnet/ip/reass/ip6_full_reass.c index ef1014922c5..10acd0e1eda 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; } |