Messages in this thread |  | | | From | "Arce, Abraham" <> | | Date | Tue, 25 May 2010 21:02:51 -0500 | | Subject | RE: NULL Pointer Deference: NFS & Telnet |
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Thanks David,
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c > > index f8abf68..eb81f76 100644 > > --- a/net/core/skbuff.c > > +++ b/net/core/skbuff.c > > @@ -334,7 +334,7 @@ static void skb_release_data(struct sk_buff *skb) > > if (!skb->cloned || > > !atomic_sub_return(skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1, > > &skb_shinfo(skb)->dataref)) { > > - if (skb_shinfo(skb)->nr_frags) { > > + if (skb_shinfo(skb)->nr_frags && skb_has_frags(skb)) { > > int i; > > for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) > > put_page(skb_shinfo(skb)->frags[i].page); > > skb_shinfo(skb)->nr_frags counts the number of entries contained > in the skb_shinfo(skb)->frags[] array. > > This has nothing to do with the frag list pointer, > skb_shinfo(skb)->frag_list, which is what skb_has_frags() > tests. > > You've got some kind of memory corruption going on and it > appears to have nothing to do with the code paths you're > playing with here.
Do you have any recommendation on debugging technique/tool for this memory corruption issue?
Best Regards Abraham
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