diff options
| author |   Simon Horman <horms@verge.net.au> | 2013-05-28 20:34:27 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-05-28 23:49:07 -0700 |
| commit | f7c0c2ae843b74f8dba55820cb0a3de19c976703 (patch) | |
| tree | e2bd88b85cecb6f616a16a5926342dd35c059a97 /net/ipv4 | |
| parent | ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header (diff) | |
| download | linux-dev-f7c0c2ae843b74f8dba55820cb0a3de19c976703.tar.xz linux-dev-f7c0c2ae843b74f8dba55820cb0a3de19c976703.zip | |
ipv4: Correct comparisons and calculations using skb->tail and skb-transport_header
This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that comparisons and calculations are always made using pointers.
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/icmp.c | 3 | ||||
| -rw-r--r-- | net/ipv4/igmp.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 3 |
3 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 562efd91f457..5d0d379b0152 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -503,7 +503,8 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) iph = ip_hdr(skb_in); if ((u8 *)iph < skb_in->head || - (skb_in->network_header + sizeof(*iph)) > skb_in->tail) + (skb_network_header(skb_in) + sizeof(*iph)) > + skb_tail_pointer(skb_in)) goto out; /* diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index d8c232794bcb..450f625361e4 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -363,7 +363,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) static int igmpv3_sendpack(struct sk_buff *skb) { struct igmphdr *pig = igmp_hdr(skb); - const int igmplen = skb->tail - skb->transport_header; + const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index ba4186e1dca9..1f58594d5a85 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2989,7 +2989,8 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb, swap(gso_skb->truesize, skb->truesize); } - delta = htonl(oldlen + (skb->tail - skb->transport_header) + + delta = htonl(oldlen + (skb_tail_pointer(skb) - + skb_transport_header(skb)) + skb->data_len); th->check = ~csum_fold((__force __wsum)((__force u32)th->check + (__force u32)delta)); |