net: Fix OOPS in skb_seq_read().
authorShyam Iyer <shyam_iyer@dell.com>
Fri, 30 Jan 2009 00:12:42 +0000 (16:12 -0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 30 Jan 2009 00:12:42 +0000 (16:12 -0800)
It oopsd for me in skb_seq_read. addr2line said it was
linux-2.6/net/core/skbuff.c:2228, which is this line:

while (st->frag_idx < skb_shinfo(st->cur_skb)->nr_frags) {

I added some printks in there and it looks like we hit this:

        } else if (st->root_skb == st->cur_skb &&
                   skb_shinfo(st->root_skb)->frag_list) {
                 st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
                 st->frag_idx = 0;
                 goto next_skb;
        }

Actually I did some testing and added a few printks and found that the
st->cur_skb->data was 0 and hence the ptr used by iscsi_tcp was null.
This caused the kernel panic.

  if (abs_offset < block_limit) {
- *data = st->cur_skb->data + abs_offset;
+ *data = st->cur_skb->data + (abs_offset - st->stepped_offset);

I enabled the debug_tcp and with a few printks found that the code did
not go to the next_skb label and could find that the sequence being
followed was this -

It hit this if condition -

        if (st->cur_skb->next) {
                st->cur_skb = st->cur_skb->next;
                st->frag_idx = 0;
                goto next_skb;

And so, now the st pointer is shifted to the next skb whereas actually
it should have hit the second else if first since the data is in the
frag_list.

        else if (st->root_skb == st->cur_skb &&
                 skb_shinfo(st->root_skb)->frag_list) {
                st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
                goto next_skb;
        }

Reversing the two conditions the attached patch fixes the issue for me
on top of Herbert's patches.

Signed-off-by: Shyam Iyer <shyam_iyer@dell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/skbuff.c

index f23fd43539ed1dce8ce010032d0de2d8c2428ffc..da74b844f4eab0464374a1a667cea8aa40a7bf26 100644 (file)
@@ -2250,13 +2250,13 @@ next_skb:
                st->frag_data = NULL;
        }
 
-       if (st->cur_skb->next) {
-               st->cur_skb = st->cur_skb->next;
+       if (st->root_skb == st->cur_skb &&
+           skb_shinfo(st->root_skb)->frag_list) {
+               st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
                st->frag_idx = 0;
                goto next_skb;
-       } else if (st->root_skb == st->cur_skb &&
-                  skb_shinfo(st->root_skb)->frag_list) {
-               st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
+       } else if (st->cur_skb->next) {
+               st->cur_skb = st->cur_skb->next;
                st->frag_idx = 0;
                goto next_skb;
        }