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authorFlorin Coras <fcoras@cisco.com>2018-12-05 10:03:34 -0800
committerDamjan Marion <dmarion@me.com>2018-12-07 15:08:58 +0000
commitb8dda5ffb6d357e085d4c2ca2d1f8e0828fc09c4 (patch)
tree2b553c05155c675e976ab1febfc8901cf999e496
parente88865d7bc9cd45b044f8aeadf1916c38e0eb165 (diff)
tcp: fix length check
Change-Id: Iff75be238a231df88a37b61610c134e4a4770708 Signed-off-by: Florin Coras <fcoras@cisco.com>
-rw-r--r--src/vnet/tcp/tcp_input.c17
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;