linux-kernel - [patch 64/86] iommu/msm: Fix error handling in msm_iommu

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Date:	Fri, 10 Feb 2012 14:30:23 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, David Brown <davidb@...eaurora.org>,
	Stepan Moskovchenko <stepanm@...eaurora.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [patch 64/86] iommu/msm: Fix error handling in msm_iommu_unmap()

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joerg Roedel <joerg.roedel@....com>

commit 05df1f3c2afaef5672627f2b7095f0d4c4dbc3a0 upstream.

Error handling in msm_iommu_unmap() is broken. On some error
conditions retval is set to a non-zero value which causes
the function to return 'len' at the end. This hides the
error from the user. Zero should be returned in those error
cases.

Cc: David Brown <davidb@...eaurora.org>
Cc: Stepan Moskovchenko <stepanm@...eaurora.org>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Acked-by: David Brown <davidb@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/msm_iommu.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -481,23 +481,19 @@ static int msm_iommu_unmap(struct iommu_
 
 	priv = domain->priv;
 
-	if (!priv) {
-		ret = -ENODEV;
+	if (!priv)
 		goto fail;
-	}
 
 	fl_table = priv->pgtable;
 
 	if (len != SZ_16M && len != SZ_1M &&
 	    len != SZ_64K && len != SZ_4K) {
 		pr_debug("Bad length: %d\n", len);
-		ret = -EINVAL;
 		goto fail;
 	}
 
 	if (!fl_table) {
 		pr_debug("Null page table\n");
-		ret = -EINVAL;
 		goto fail;
 	}
 
@@ -506,7 +502,6 @@ static int msm_iommu_unmap(struct iommu_
 
 	if (*fl_pte == 0) {
 		pr_debug("First level PTE is 0\n");
-		ret = -ENODEV;
 		goto fail;
 	}
 


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