diff options
Diffstat (limited to 'src/fastd.c')
| -rw-r--r-- | src/fastd.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/fastd.c b/src/fastd.c index 70bd99e..1f606c0 100644 --- a/src/fastd.c +++ b/src/fastd.c @@ -602,6 +602,12 @@ void fastd_send_handshake(fastd_context_t *ctx, const fastd_socket_t *sock, cons void fastd_handle_receive(fastd_context_t *ctx, fastd_peer_t *peer, fastd_buffer_t buffer) { if (ctx->conf->mode == MODE_TAP) { + if (buffer.len < ETH_HLEN) { + pr_debug(ctx, "received truncated packet"); + fastd_buffer_free(buffer); + return; + } + const fastd_eth_addr_t *src_addr = fastd_get_source_address(ctx, buffer); if (fastd_eth_addr_is_unicast(src_addr)) @@ -841,6 +847,12 @@ static void handle_tun(fastd_context_t *ctx) { fastd_peer_t *peer = NULL; if (ctx->conf->mode == MODE_TAP) { + if (buffer.len < ETH_HLEN) { + pr_debug(ctx, "truncated packet on tap interface"); + fastd_buffer_free(buffer); + return; + } + const fastd_eth_addr_t *dest_addr = fastd_get_dest_address(ctx, buffer); if (fastd_eth_addr_is_unicast(dest_addr)) { peer = fastd_peer_find_by_eth_addr(ctx, dest_addr); |