linux-kernel - [PATCH] fs/proc/task_mmu: fix uninitialized variable in pagemap_pmd

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Date: Thu, 13 Jun 2024 17:34:33 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>,
	Andrei Vagin <avagin@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Hugh Dickins <hughd@...gle.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] fs/proc/task_mmu: fix uninitialized variable in
 pagemap_pmd_range()

The "folio" pointer is tested for NULL, but it's either valid or
uninitialized.  Initialize it to NULL.

Fixes: 84f57f8b8914 ("fs/proc: move page_mapcount() to fs/proc/internal.h")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 fs/proc/task_mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 631371cb80a0..6ed1f56b32b4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1492,7 +1492,7 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 		u64 flags = 0, frame = 0;
 		pmd_t pmd = *pmdp;
 		struct page *page = NULL;
-		struct folio *folio;
+		struct folio *folio = NULL;
 
 		if (vma->vm_flags & VM_SOFTDIRTY)
 			flags |= PM_SOFT_DIRTY;
-- 
2.43.0