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SubjectRe: [PATCH] msm: iommu: fix leak and invalid access
On Wed, 15 May 2013 12:47:03 +0800 Libo Chen <clbchenlibo.chen@huawei.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@linux-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@codeaurora.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Libo Chen <clbchenlibo.chen@huawei.com>
Cc: Libo Chen <libo.chen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-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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