From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 2 Sep 2005 00:48:59 +0000 (-0700)
Subject: [TCP]: Fix sk_forward_alloc underflow in tcp_sendmsg
X-Git-Tag: v2.6.14-rc1~777^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef015786152adaff5a6a8bf0c8ea2f70cee8059d;p=pandora-kernel.git

[TCP]: Fix sk_forward_alloc underflow in tcp_sendmsg

I've finally found a potential cause of the sk_forward_alloc underflows
that people have been reporting sporadically.

When tcp_sendmsg tacks on extra bits to an existing TCP_PAGE we don't
check sk_forward_alloc even though a large amount of time may have
elapsed since we allocated the page.  In the mean time someone could've
come along and liberated packets and reclaimed sk_forward_alloc memory.

This patch makes tcp_sendmsg check sk_forward_alloc every time as we
do in do_tcp_sendpages.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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