linux-kernel - Re: + cifs-check-for-granted-memory.patch added to -mm tree

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Message-ID: <20070818034246.GA7225@cvg>
Date:	Sat, 18 Aug 2007 07:42:46 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	linux-kernel@...r.kernel.org, sfrench@...ibm.com
Subject: Re: + cifs-check-for-granted-memory.patch added to -mm tree

[Jesper Juhl - Sat, Aug 18, 2007 at 12:17:33AM +0200]
| On 17/08/07, akpm@...ux-foundation.org <akpm@...ux-foundation.org> wrote:
| >
| > The patch titled
| >      CIFS: check for granted memory
| > has been added to the -mm tree.  Its filename is
| >      cifs-check-for-granted-memory.patch
| >
| > *** Remember to use Documentation/SubmitChecklist when testing your code ***
| >
| > See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
| > out what to do about this
| >
| > ------------------------------------------------------
| > Subject: CIFS: check for granted memory
| > From: Cyrill Gorcunov <gorcunov@...il.com>
| >
| > Add a check for granted memory to prevent possible NULL pointer usage.
| >
| > Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
| > Cc: Steven French <sfrench@...ibm.com>
| > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
| > ---
| >
| >  fs/cifs/sess.c |    4 ++++
| >  1 files changed, 4 insertions(+)
| >
| > diff -puN fs/cifs/sess.c~cifs-check-for-granted-memory fs/cifs/sess.c
| > --- a/fs/cifs/sess.c~cifs-check-for-granted-memory
| > +++ a/fs/cifs/sess.c
| > @@ -372,6 +372,10 @@ CIFS_SessSetup(unsigned int xid, struct
| >
| >         /* 2000 big enough to fit max user, domain, NOS name etc. */
| >         str_area = kmalloc(2000, GFP_KERNEL);
| > +       if (str_area == NULL) {
| > +               cifs_small_buf_release(smb_buf);
| > +               return -ENOMEM;
| > +       }
| 
| The patch, as such, is fine - not arguing against it, but as a matter
| of style; don't we usually prefer the "if (!foo)" form over "if (foo
| == NULL)" ??

I just don't wanna mess 'if (!ptr)' and 'if (ptr == NULL)'
in the procedure. Look at the code ;) Some procs in CIFS
_does_ use '!ptr' but others - 'ptr == NULL'. So in the
proc being patched 'if (ptr == NULL)' is assumed.

| 
| -- 
| Jesper Juhl <jesper.juhl@...il.com>
| Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
| Plain text mails only, please      http://www.expita.com/nomime.html
| 


		Cyrill

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