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-rw-r--r--vnet/vnet/ip/ip_frag.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/vnet/vnet/ip/ip_frag.c b/vnet/vnet/ip/ip_frag.c
index 5437c265c95..38befc2b2ea 100644
--- a/vnet/vnet/ip/ip_frag.c
+++ b/vnet/vnet/ip/ip_frag.c
@@ -274,6 +274,13 @@ ip6_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *err
payload += payload[1] * 8;
}
+ if (PREDICT_FALSE(payload >= (u8 *)vlib_buffer_get_current(p) + p->current_length)) {
+ //A malicious packet could set an extension header with a too big size
+ //and make us modify another vlib_buffer
+ *error = IP6_ERROR_TOO_SHORT;
+ return;
+ }
+
u8 has_more;
u16 initial_offset;
if (*next_header == IP_PROTOCOL_IPV6_FRAGMENTATION) {