diff options
| author |   Benoît Ganne <bganne@cisco.com> | 2019-10-23 13:53:49 +0200 |
|---|---|---|
| committer |   Ole Trøan <otroan@employees.org> | 2019-10-28 09:13:50 +0000 |
| commit | cf7803d2e864fb71f14943a544ac309d3d0510cb (patch) | |
| tree | 2c12f423d25fe37c2596a31b8e09742d95628e77 | |
| parent | 1b1ccadc900deffd7b8e306ae8dce79a3115778c (diff) | |
ip: reassembly: fix use-after-free
When processing the last buffer of a reassembled packet, the current
buffer will be freed and must be reloaded using the updated index.
Type: fix
Change-Id: Ib39e29e60eb527b4cd4828a3aa37d82c8dddd709
Signed-off-by: Benoît Ganne <bganne@cisco.com>
| -rw-r--r-- | src/vnet/ip/reass/ip4_full_reass.c | 7 | ||||
| -rw-r--r-- | src/vnet/ip/reass/ip6_full_reass.c | 8 |
2 files changed, 10 insertions, 5 deletions
diff --git a/src/vnet/ip/reass/ip4_full_reass.c b/src/vnet/ip/reass/ip4_full_reass.c index 303f23337ee..f6c05466e19 100644 --- a/src/vnet/ip/reass/ip4_full_reass.c +++ b/src/vnet/ip/reass/ip4_full_reass.c @@ -1224,13 +1224,17 @@ ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, packet_enqueue: - b0->error = node->errors[error0]; if (bi0 != ~0) { to_next[0] = bi0; to_next += 1; n_left_to_next -= 1; + + /* bi0 might have been updated by reass_finalize, reload */ + b0 = vlib_get_buffer (vm, bi0); + b0->error = node->errors[error0]; + if (next0 == IP4_FULL_REASS_NEXT_HANDOFF) { if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) @@ -1243,7 +1247,6 @@ ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, } else if (is_feature && IP4_ERROR_NONE == error0) { - b0 = vlib_get_buffer (vm, bi0); vnet_feature_next (&next0, b0); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, diff --git a/src/vnet/ip/reass/ip6_full_reass.c b/src/vnet/ip/reass/ip6_full_reass.c index aaaf56a5d59..4e9079d060d 100644 --- a/src/vnet/ip/reass/ip6_full_reass.c +++ b/src/vnet/ip/reass/ip6_full_reass.c @@ -1199,14 +1199,17 @@ ip6_full_reassembly_inline (vlib_main_t * vm, error0 = IP6_ERROR_REASS_LIMIT_REACHED; } - b0->error = node->errors[error0]; - if (~0 != bi0) { skip_reass: to_next[0] = bi0; to_next += 1; n_left_to_next -= 1; + + /* bi0 might have been updated by reass_finalize, reload */ + b0 = vlib_get_buffer (vm, bi0); + b0->error = node->errors[error0]; + if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF) { if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) @@ -1219,7 +1222,6 @@ ip6_full_reassembly_inline (vlib_main_t * vm, } else if (is_feature && IP6_ERROR_NONE == error0) { - b0 = vlib_get_buffer (vm, bi0); vnet_feature_next (&next0, b0); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |