lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <50DA61E8.5090009@asianux.com>
Date:	Wed, 26 Dec 2012 10:33:12 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Theodore Ts'o <tytso@....edu>
CC:	jack@...e.cz, akpm@...ux-foundation.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] fs/ext3: set pointer = NULL, after kfree it

于 2012年12月26日 02:51, Theodore Ts'o 写道:
> On Mon, Dec 24, 2012 at 01:58:14PM +0800, Chen Gang wrote:
>>
>>   set s->base = NULL, after kfree it.
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> 
> Was this to fix something flagged by some static code checker?  The
> only caller of ext3_xattr_block_set() is ext3_xattr_set_handle(), and
> s->base is stored on the stack, and as soon as ext3_xattr_block_set()
> returns, the object will disappear.  So it seems pretty hard to see
> how this could lead to a use-after-free bug.
> 
>     	       	       	 		- Ted
> 
> 

  this patch is not for a bug

  it is only for coding habit:
    it is better to set is to NULL, after kfree it.
    in the future, if another functions need call ext3_xattr_block_set, too.
      it will avoid another members to make mistake.

  since it is not for fixing bug, it is really a minor patch.
  I can understand if you do not apply it.

-- 
Chen Gang

Asianux Corporation
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ