linux-kernel - Re: [PATCH] mm: Check NULL pointer Dereference in mm/filemap.c

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Message-Id: <20100727161049.eeac8c7c.akpm@linux-foundation.org>
Date:	Tue, 27 Jul 2010 16:10:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	wzt.wzt@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: Check NULL pointer Dereference in mm/filemap.c

On Mon, 26 Jul 2010 16:25:42 +0800
wzt.wzt@...il.com wrote:

> mapping->a_ops->direct_IO() is not checked, if it's a NULL pointer, 
> that will casue an oops. pagecache_write_begin/end is exported to
> other functions, so they need to check null pointer before use them. 
> 

The patch checks a lot more things than ->directIO!

It would be best to not add this overhead if possible.  Did you
actually observe an oops?  If so, please fully describe it.

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