linux-kernel - [PATCH] mm/hmm: fix uninitialized use of 'entry' in hmm_vma_walk

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Date:   Mon, 22 Jan 2018 13:57:59 -0500
From:   jglisse@...hat.com
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        Ralph Campbell <rcampbell@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>
Subject: [PATCH] mm/hmm: fix uninitialized use of 'entry' in hmm_vma_walk_pmd()

From: Ralph Campbell <rcampbell@...dia.com>

The variable 'entry' is used before being initialized in
hmm_vma_walk_pmd()

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
---
 mm/hmm.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index ea19742a5d60..979211c7ccc8 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -418,7 +418,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
 		}
 
 		if (!pte_present(pte)) {
-			swp_entry_t entry;
+			swp_entry_t entry = pte_to_swp_entry(pte);
 
 			if (!non_swap_entry(entry)) {
 				if (hmm_vma_walk->fault)
@@ -426,8 +426,6 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
 				continue;
 			}
 
-			entry = pte_to_swp_entry(pte);
-
 			/*
 			 * This is a special swap entry, ignore migration, use
 			 * device and report anything else as error.
-- 
2.14.3