linux-kernel - Re: [PATCH] msm: iommu: fix leak and invalid access

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Date:	Thu, 23 May 2013 16:26:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Libo Chen <clbchenlibo.chen@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] msm: iommu: fix leak and invalid access

On Wed, 15 May 2013 12:47:03 +0800 Libo Chen <clbchenlibo.chen@...wei.com> wrote:

> It fixes two obvious problems:
> 1. We have registered msm_iommu_driver first, and need unregister it when
> registered msm_iommu_ctx_driver fail

yup, that's a bug.

> 2. We don`t need to kfree drvdata before kzalloc successful

The code's OK at present - kfree(NULL) is legal.

However I suppose the patch cleans things up a little bit, however it
missed a couple of things:



From: Andrew Morton <akpm@...ux-foundation.org>
Subject: drivers-iommu-msm_iommu_devc-fix-leak-and-invalid-access-fix

remove now-unneeded initialization of ctx_drvdata, remove unneeded braces

Cc: David Brown <davidb@...eaurora.org>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: James Hogan <james.hogan@...tec.com>
Cc: Libo Chen <clbchenlibo.chen@...wei.com>
Cc: Libo Chen <libo.chen@...wei.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/iommu/msm_iommu_dev.c |   13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff -puN drivers/iommu/msm_iommu_dev.c~drivers-iommu-msm_iommu_devc-fix-leak-and-invalid-access-fix drivers/iommu/msm_iommu_dev.c
--- a/drivers/iommu/msm_iommu_dev.c~drivers-iommu-msm_iommu_devc-fix-leak-and-invalid-access-fix
+++ a/drivers/iommu/msm_iommu_dev.c
@@ -289,22 +289,19 @@ static int msm_iommu_ctx_probe(struct pl
 {
 	struct msm_iommu_ctx_dev *c = pdev->dev.platform_data;
 	struct msm_iommu_drvdata *drvdata;
-	struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL;
+	struct msm_iommu_ctx_drvdata *ctx_drvdata;
 	int i, ret;
-	if (!c || !pdev->dev.parent) {
+
+	if (!c || !pdev->dev.parent)
 		return -EINVAL;
-	}
 
 	drvdata = dev_get_drvdata(pdev->dev.parent);
-
-	if (!drvdata) {
+	if (!drvdata)
 		return -ENODEV;
-	}
 
 	ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL);
-	if (!ctx_drvdata) {
+	if (!ctx_drvdata)
 		return -ENOMEM;
-	}
 
 	ctx_drvdata->num = c->num;
 	ctx_drvdata->pdev = pdev;
_

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