linux-kernel - [PATCH] mm: vmalloc: fix uninitialized value issue

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Message-Id: <20251014102337.5453-1-yadong.qi@linux.alibaba.com>
Date: Tue, 14 Oct 2025 18:23:37 +0800
From: Yadong Qi <yadong.qi@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	urezki@...il.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	ying.huang@...ux.alibaba.com,
	dan.carpenter@...aro.org
Cc: Yadong Qi <yadong.qi@...ux.alibaba.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH] mm: vmalloc: fix uninitialized value issue

Issues reported by LKP:
  mm/vmalloc.c:191 vmap_pmd_range() error: uninitialized symbol 'err'.
  mm/vmalloc.c:243 vmap_pud_range() error: uninitialized symbol 'err'.
  mm/vmalloc.c:295 vmap_p4d_range() error: uninitialized symbol 'err'.

Fix by initailizing err with 0.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202510110050.VG9YKMRK-lkp@intel.com/
Signed-off-by: Yadong Qi <yadong.qi@...ux.alibaba.com>
---
 mm/vmalloc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c0213118a75e..6d6d4cf3e176 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -170,7 +170,7 @@ static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
 {
 	pmd_t *pmd;
 	unsigned long next;
-	int err;
+	int err = 0;
 
 	pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
 	if (!pmd)
@@ -222,7 +222,7 @@ static int vmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
 {
 	pud_t *pud;
 	unsigned long next;
-	int err;
+	int err = 0;
 
 	pud = pud_alloc_track(&init_mm, p4d, addr, mask);
 	if (!pud)
@@ -274,7 +274,7 @@ static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
 {
 	p4d_t *p4d;
 	unsigned long next;
-	int err;
+	int err = 0;
 
 	p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
 	if (!p4d)
-- 
2.43.5