linux-kernel - Re: [PATCH v2] sparc: kernel/sbus.c: fix memory leakage

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Date:	Thu, 17 Jan 2013 11:56:37 +0000
From:	Cong Ding <dinggnu@...il.com>
To:	Richard Mortimer <richm@...elvet.org.uk>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sparc: kernel/sbus.c: fix memory leakage

On Thu, Jan 17, 2013 at 10:41:59AM +0000, Richard Mortimer wrote:
> 
> 
> On 16/01/2013 22:01, Cong Ding wrote:
> >the variable iommu and strbuf are not freed if it goes to error.
> >
> >Signed-off-by: Cong Ding <dinggnu@...il.com>
> >---
> >  arch/sparc/kernel/sbus.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> >diff --git a/arch/sparc/kernel/sbus.c b/arch/sparc/kernel/sbus.c
> >index 1271b3a..78aa26b 100644
> >--- a/arch/sparc/kernel/sbus.c
> >+++ b/arch/sparc/kernel/sbus.c
> >@@ -656,6 +656,8 @@ static void __init sbus_iommu_init(struct platform_device *op)
> >  	return;
> >
> >  fatal_memory_error:
> >+	kfree(strbuf);
> 
> strbuf will be uninitialized if the iommu allocation fails. I don't
> have a particular preference for how to fix this but tend to dislike
> initial assignment with NULL because it hides other control flow
> issues.
Sorry I didn't notice strbuf will be uninitialized here. But if we don't
initially assign a NULL value to strbuf, I cannot find a way to handle it
besides the first version patch. Did you have any suggestions? For me, I like
the first version.
- cong
> 
> Regards
> 
> Richard
> 
> >+	kfree(iommu);
> >  	prom_printf("sbus_iommu_init: Fatal memory allocation error.\n");
> >  }
> >
> >
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