netdev - Re: [PATCH] drivers/isdn: checkng length to be sure not memory overflow

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Message-ID: <51355653.9090404@asianux.com>
Date:	Tue, 05 Mar 2013 10:20:03 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	Jiri Kosina <jkosina@...e.cz>, isdn@...ux-pingi.de,
	Greg KH <gregkh@...uxfoundation.org>, alan@...ux.intel.com,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] drivers/isdn: checkng length to be sure not memory overflow

于 2013年02月28日 21:43, Jiri Slaby 写道:
> 
> Nah, there *are* still people using ISDN.
> 

  ok, thanks.

  it seems, we need maintaining ISDN:
    need fix bugs.
    need not add new features.
    need keep current features no touch.


> No, we cannot be sure that a user gives us less than that. Your patch
> just throws the rest to fix that overflow, right? What I'm saying I
> wouldn't fix more than that.

  what you said is: this patch need improving, is it correct ?
  if it is correct.
    I still prefer to throw the rest contents (but need improving, too)
      for maintaining, we need fix bug, but not need add new features
      so what we should do:
        a) fix the bug (should not memory overflow)
        b) keep the original buffer length no touch
           it is not sizeof(cmd.parm.cmsg.para) - 2)
           it should be sizeof(cmd.param) - sizeof(cmd.param.cmsg) + sizeof(cmd.param.cmsg.para) - 2
        c) need complete the relative document to export the limitation.

  is it ok ?
    (if it is not ok, welcome to provide suggestion or completion)


  thanks.

  :-)

-- 
Chen Gang

Asianux Corporation
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