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authorSimon Horman <horms@verge.net.au>2013-05-28 20:34:27 +0000
committerDavid S. Miller <davem@davemloft.net>2013-05-28 23:49:07 -0700
commitf7c0c2ae843b74f8dba55820cb0a3de19c976703 (patch)
treee2bd88b85cecb6f616a16a5926342dd35c059a97 /net/ipv4/icmp.c
parent29a3cad5c6ae9e7fbf1509d01d39c3c3c38f11f9 (diff)
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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/icmp.c')
-rw-r--r--net/ipv4/icmp.c3
1 files changed, 2 insertions, 1 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;
/*