diff options
Diffstat (limited to 'src/vnet/tcp')
| -rw-r--r-- | src/vnet/tcp/tcp_input.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index e15ad73e2d1..4614772d008 100644 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -3302,13 +3302,19 @@ tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, if (is_ip4) { ip4_header_t *ip4 = vlib_buffer_get_current (b); + int ip_hdr_bytes = ip4_header_bytes (ip4); + if (PREDICT_FALSE (b->current_length < ip_hdr_bytes + sizeof (*tcp))) + { + *error = TCP_ERROR_LENGTH; + return 0; + } tcp = ip4_next_header (ip4); vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip4; - n_advance_bytes = (ip4_header_bytes (ip4) + tcp_header_bytes (tcp)); + n_advance_bytes = (ip_hdr_bytes + tcp_header_bytes (tcp)); n_data_bytes = clib_net_to_host_u16 (ip4->length) - n_advance_bytes; /* Length check. Checksum computed by ipx_local no need to compute again */ - if (PREDICT_FALSE (n_advance_bytes < 0)) + if (PREDICT_FALSE (n_data_bytes < 0)) { *error = TCP_ERROR_LENGTH; return 0; @@ -3322,6 +3328,11 @@ tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, else { ip6_header_t *ip6 = vlib_buffer_get_current (b); + if (PREDICT_FALSE (b->current_length < sizeof (*ip6) + sizeof (*tcp))) + { + *error = TCP_ERROR_LENGTH; + return 0; + } tcp = ip6_next_header (ip6); vnet_buffer (b)->tcp.hdr_offset = (u8 *) tcp - (u8 *) ip6; n_advance_bytes = tcp_header_bytes (tcp); @@ -3329,7 +3340,7 @@ tcp_input_lookup_buffer (vlib_buffer_t * b, u8 thread_index, u32 * error, - n_advance_bytes; n_advance_bytes += sizeof (ip6[0]); - if (PREDICT_FALSE (n_advance_bytes < 0)) + if (PREDICT_FALSE (n_data_bytes < 0)) { *error = TCP_ERROR_LENGTH; return 0; |