netdev - Re: [PATCH] tcp_sendpage(): fix broken page iteration

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Date:	Sun, 18 Mar 2007 14:49:27 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	da-x@...atomic.org
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp_sendpage(): fix broken page iteration

From: Dan Aloni <da-x@...atomic.org>
Date: Sun, 18 Mar 2007 14:43:46 +0200

> do_tcp_sendpages() should not iterate 'pages' as an array since 
> it is not an array of 'struct page *', but a pointer to a single 
> entity of 'struct page *' passed on the stack as a parameter to 
> tcp_send_page() (hence it would crash if poffset + psize > PAGE_SIZE,
> because pages[1] and beyond most probably not constitutes a valid 
> 'struct page *').

do_tcp_sendpages() should never get passed poffset+psize>PAGE_SIZE,
that would be a bug.

Feel free to add a BUG() check for that if you wish, and a fix for any
caller which violates this.

The code is perfectly fine as-is.  It was originally written to accept
page arrays, but once it was decided that ->sendpage() would only pass
in one page, we simply modified to caller of do_tcp_sendpages() to
accomodate this argument passing change, instead of changing
do_tcp_sendpages() which is totally unnecessary.
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