diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2013-12-06 19:26:40 +0000 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2013-12-06 20:41:22 +0000 |
| commit | e5a498e943fbc497f236ab8cf31366c75f337ce6 (patch) | |
| tree | f608e770abc0d83bdf402c2e9e6b97ad1b9dbdb0 | |
| parent | e1ca87bb1b64b044163e686ff3bb71405156c561 (diff) | |
sfc: Add length checks to efx_xmit_with_hwtstamp() and efx_ptp_is_ptp_tx()
efx_ptp_is_ptp_tx() must be robust against skbs from raw sockets that
have invalid IPv4 and UDP headers.
Add checks that:
- the transport header has been found
- there is enough space between network and transport header offset
for an IPv4 header
- there is enough space after the transport header offset for a
UDP header
Fixes: 7c236c43b838 ('sfc: Add support for IEEE-1588 PTP')
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
| -rw-r--r-- | drivers/net/ethernet/sfc/ptp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c index 03acf57df045..93a61a157d10 100644 --- a/drivers/net/ethernet/sfc/ptp.c +++ b/drivers/net/ethernet/sfc/ptp.c @@ -989,7 +989,11 @@ bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) skb->len >= PTP_MIN_LENGTH && skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && likely(skb->protocol == htons(ETH_P_IP)) && + skb_transport_header_was_set(skb) && + skb_network_header_len(skb) >= sizeof(struct iphdr) && ip_hdr(skb)->protocol == IPPROTO_UDP && + skb_headlen(skb) >= + skb_transport_offset(skb) + sizeof(struct udphdr) && udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); } |