linux-kernel - Re: [GIT] Networking

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Date:	Wed, 11 Feb 2015 01:45:02 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT] Networking

On Tue, Feb 10, 2015 at 01:50:16PM -0800, Linus Torvalds wrote:
> On Tue, Feb 10, 2015 at 1:26 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > Just to confirm that yes, it's that particular commit 1d10eb2f156f.
> >
> > I reverted it and things work again. So it's not the miscalculation of
> > "used" , but it's certainly *something* in that commit.
> 
> How about this?
> 
> -       npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
> +       npages = PAGE_ALIGN(off + n);
> 
> The two are not even *remotely* the same thing.

The latter isn't a replacement for the former, but yes, it is bogus - bytes
instead of pages.  

Could you check if

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index eb78fe8..5b11d64 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -348,7 +348,7 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
 	if (n < 0)
 		return n;
 
-	npages = PAGE_ALIGN(off + n);
+	npages = DIV_ROUND_UP(off + n, PAGE_SIZE);
 	if (WARN_ON(npages == 0))
 		return -EINVAL;
 

on top of what went into Dave's tree is enough to fix what you are seeing?
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