From 0f6bb83cb12e4617e696ffa566f3fc6c092686e2 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 30 Nov 2010 16:49:02 +0800
Subject: [PATCH] crypto: algif_skcipher - Fixed overflow when sndbuf is page
 aligned

When sk_sndbuf is not a multiple of PAGE_SIZE, the limit tests
in sendmsg fail as the limit variable becomes negative and we're
using an unsigned comparison.

The same thing can happen if sk_sndbuf is lowered after a sendmsg
call.

This patch fixes this by always taking the signed maximum of limit
and 0 before we perform the comparison.

It also rounds the value of sk_sndbuf down to a multiple of PAGE_SIZE
so that we don't end up allocating a page only to use a small number
of bytes in it because we're bound by sk_sndbuf.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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