From: yzhai003@ucr.edu <yzhai003@ucr.edu>
Date: Fri, 1 Jun 2018 18:30:14 +0000 (-0700)
Subject: iommu/amd: Argument page_size could be uninitialized
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4674686d6c8974eb4eebec894c398a0f6c506af3;p=linux.git

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@ucr.edu <yzhai003@ucr.edu>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 596b95c50051d..e688169721b88 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1404,6 +1404,8 @@ static u64 *fetch_pte(struct protection_domain *domain,
 	int level;
 	u64 *pte;
 
+	*page_size = 0;
+
 	if (address > PM_LEVEL_SIZE(domain->mode))
 		return NULL;