linux-kernel - Re: [PATCH 6/9] arch/powerpc/platforms/pseries/iommu.c: add missing kfree

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Date:	Mon, 8 Aug 2011 10:47:10 -0700
From:	Nishanth Aravamudan <nacc@...ibm.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Milton Miller <miltonm@....com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 6/9] arch/powerpc/platforms/pseries/iommu.c: add missing
 kfree

On 08.08.2011 [13:18:00 +0200], Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> At this point, window has not been stored anywhere, so it has to be freed
> before leaving the function.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @exists@
> local idexpression x;
> statement S,S1;
> expression E;
> identifier fl;
> expression *ptr != NULL;
> @@
> 
> x = \(kmalloc\|kzalloc\|kcalloc\)(...);
> ...
> if (x == NULL) S
> <... when != x
>      when != if (...) { <+...kfree(x)...+> }
>      when any
>      when != true x == NULL
> x->fl
> ...>
> (
> if (x == NULL) S1
> |
> if (...) { ... when != x
>                when forall
> (
>  return \(0\|<+...x...+>\|ptr\);
> |
> * return ...;
> )
> }
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: Nishanth Aravamudan <nacc@...ibm.com>

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@...ibm.com>
IBM Linux Technology Center
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