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List:       kernel-janitors
Subject:    Re: [PATCH 3/4] arch/m68k/mm/kmap.c: introduce missing kfree
From:       Geert Uytterhoeven <geert () linux-m68k ! org>
Date:       2008-09-10 20:37:19
Message-ID: Pine.LNX.4.64.0809102237040.29543 () anakin
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On Wed, 10 Sep 2008, Julia Lawall wrote:
> From: Julia Lawall <julia@diku.dk>
> 
> Error handling code following a kmalloc should free the allocated data.
> 
> The semantic match that finds the problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @r exists@
> local idexpression x;
> statement S;
> expression E;
> identifier f,l;
> position p1,p2;
> expression *ptr != NULL;
> @@
> 
> (
> if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
> |
> x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
> ...
> if (x == NULL) S
> )
> <... when != x
>      when != if (...) { <+...x...+> }
> x->f = E
> ...>
> (
>  return \(0\|<+...x...+>\|ptr\);
> |
>  return@p2 ...;
> )
> 
> @script:python@
> p1 << r.p1;
> p2 << r.p2;
> @@
> 
> print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@diku.dk>
> ---
>  arch/m68k/mm/kmap.c           |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)

Thanks, queued for 2.6.28.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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