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-rw-r--r--src/vnet/ip/ip4_reassembly.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/src/vnet/ip/ip4_reassembly.c b/src/vnet/ip/ip4_reassembly.c
index 346b223416e..3e9d22f7e55 100644
--- a/src/vnet/ip/ip4_reassembly.c
+++ b/src/vnet/ip/ip4_reassembly.c
@@ -930,13 +930,11 @@ ip4_reassembly_inline (vlib_main_t * vm,
}
else
{
- ip4_header_t *fip = vlib_buffer_get_current (b0);
- const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
+ const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
const u32 fragment_length =
- clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
+ clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
const u32 fragment_last = fragment_first + fragment_length - 1;
- if (fragment_first > fragment_last
- || fragment_first + fragment_length > UINT16_MAX - 20)
+ if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791
{
next0 = IP4_REASSEMBLY_NEXT_DROP;
error0 = IP4_ERROR_REASS_MALFORMED_PACKET;