From: Olaf Kirch <olaf.kirch@oracle.com>
Date: Sun, 24 Jun 2007 06:11:52 +0000 (-0700)
Subject: [NET]: Make skb_seq_read unmap the last fragment
X-Git-Tag: v2.6.22-rc6~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b5a60da281c767196427ce8144deae6ec46b389;p=pandora-kernel.git

[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>
---

Reading git-diff-tree failed