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authorPatrick McHardy <kaber@trash.net>2006-09-18 02:59:57 -0400
committerDavid S. Miller <davem@davemloft.net>2006-09-18 02:59:57 -0400
commitcbe21d8fefca605b90e34f0f019505e599712f9b (patch)
treeb30a61468e18c04c91549231d4ca3b2cb67cb52b /net/packet
parent080f22c0dc544e498e57ad281a9de063fa839957 (diff)
[PACKET]: Don't truncate non-linear skbs with mmaped IO
Non-linear skbs are truncated to their linear part with mmaped IO. Fix by using skb_copy_bits instead of memcpy. Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index f9cef3671593..4172a5235916 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -626,8 +626,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
626 if ((int)snaplen < 0) 626 if ((int)snaplen < 0)
627 snaplen = 0; 627 snaplen = 0;
628 } 628 }
629 if (snaplen > skb->len-skb->data_len)
630 snaplen = skb->len-skb->data_len;
631 629
632 spin_lock(&sk->sk_receive_queue.lock); 630 spin_lock(&sk->sk_receive_queue.lock);
633 h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); 631 h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head);
@@ -644,7 +642,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
644 status &= ~TP_STATUS_LOSING; 642 status &= ~TP_STATUS_LOSING;
645 spin_unlock(&sk->sk_receive_queue.lock); 643 spin_unlock(&sk->sk_receive_queue.lock);
646 644
647 memcpy((u8*)h + macoff, skb->data, snaplen); 645 skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen);
648 646
649 h->tp_len = skb->len; 647 h->tp_len = skb->len;
650 h->tp_snaplen = snaplen; 648 h->tp_snaplen = snaplen;