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skbuff: don't corrupt mac_header on skb expansion 

The skb mac_header field is sometimes NULL (or ~0u) as a sentinel
value. The places where skb is expanded add an offset which would
change this flag into an invalid pointer (or offset).

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2009-06-17 12:17:34 +00:00 committed by David S. Miller
parent 19633e129c
commit 603a8bbe62
1 changed files with 6 additions and 3 deletions
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9
net/core/skbuff.c
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@ -661,7 +661,8 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
/* {transport,network,mac}_header are relative to skb->head */
new->transport_header += offset;
new->network_header += offset;
new->mac_header += offset;
if (skb_mac_header_was_set(new))
new->mac_header += offset;
#endif
skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
@ -843,7 +844,8 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
skb->tail += off;
skb->transport_header += off;
skb->network_header += off;
skb->mac_header += off;
if (skb_mac_header_was_set(skb))
skb->mac_header += off;
skb->csum_start += nhead;
skb->cloned = 0;
skb->hdr_len = 0;
@ -935,7 +937,8 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
#ifdef NET_SKBUFF_DATA_USES_OFFSET
n->transport_header += off;
n->network_header += off;
n->mac_header += off;
if (skb_mac_header_was_set(skb))
n->mac_header += off;
#endif
return n;