linux-kernel - [PATCH] iommu/amd: Argument page

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Message-Id: <1527877815-11132-1-git-send-email-yzhai003@ucr.edu>
Date:   Fri,  1 Jun 2018 11:30:14 -0700
From:   "yzhai003@....edu" <yzhai003@....edu>
To:     Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     yzhai003@....edu, csong@...ucr.edu, zhiyunq@...ucr.edu
Subject: [PATCH] iommu/amd: Argument page_size could be uninitialized

Argument "page_size" passing to function "fetch_pte" could be
uninitialized if the function returns NULL

The caller "iommu_unmap_page" checks the return value but the page_size is
used outside the if block.

Signed-off-by: yzhai003@....edu <yzhai003@....edu>
---
 drivers/iommu/amd_iommu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 8fb8c73..7c15eaf 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1398,6 +1398,8 @@ static u64 *fetch_pte(struct protection_domain *domain,
 	int level;
 	u64 *pte;
 
+	*page_size = 0;
+
 	if (address > PM_LEVEL_SIZE(domain->mode))
 		return NULL;
 
-- 
2.7.4