tree 02ac728c14eb8fa0bd49ac8ede6f15e760ddc3f3
parent 515e06c4556bd8388db6b2bb2cd8859126932946
author Olaf Kirch <olaf.kirch@oracle.com> 1182665512 -0700
committer David S. Miller <davem@davemloft.net> 1182665512 -0700

[NET]: Make skb_seq_read unmap the last fragment

Having walked through the entire skbuff, skb_seq_read would leave the
last fragment mapped.  As a consequence, the unwary caller would leak
kmaps, and proceed with preempt_count off by one. The only (kind of
non-intuitive) workaround is to use skb_seq_read_abort.

This patch makes sure skb_seq_read always unmaps frag_data after
having cycled through the skb's paged part.

Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>