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[NET]: Fix ___pskb_trim when entire frag_list needs dropping 

When the trim point is within the head and there is no paged data,
___pskb_trim fails to drop the first element in the frag_list.
This patch fixes this by moving the len <= offset case out of the
page data loop.

This patch also adds a missing kfree_skb on the frag that we just
cloned.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-07-30 20:20:28 -07:00 committed by David S. Miller
parent 9cd3ecd674
commit f4d26fb336
1 changed files with 10 additions and 4 deletions
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14
net/core/skbuff.c
View File

@ -846,7 +846,11 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
unlikely((err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))))
return err;
for (i = 0; i < nfrags; i++) {
i = 0;
if (offset >= len)
goto drop_pages;
for (; i < nfrags; i++) {
int end = offset + skb_shinfo(skb)->frags[i].size;
if (end < len) {
@ -854,9 +858,9 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
continue;
}
if (len > offset)
skb_shinfo(skb)->frags[i++].size = len - offset;
skb_shinfo(skb)->frags[i++].size = len - offset;
drop_pages:
skb_shinfo(skb)->nr_frags = i;
for (; i < nfrags; i++)
@ -864,7 +868,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
if (skb_shinfo(skb)->frag_list)
skb_drop_fraglist(skb);
break;
goto done;
}
for (fragp = &skb_shinfo(skb)->frag_list; (frag = *fragp);
@ -879,6 +883,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
return -ENOMEM;
nfrag->next = frag->next;
kfree_skb(frag);
frag = nfrag;
*fragp = frag;
}
@ -897,6 +902,7 @@ int ___pskb_trim(struct sk_buff *skb, unsigned int len)
break;
}
done:
if (len > skb_headlen(skb)) {
skb->data_len -= skb->len - len;
skb->len = len;