linux-kernel - [PATCH] m68k: sun3: Add check for __pgd

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Message-Id: <20250217160017.2375536-1-haoxiang_li2024@163.com>
Date: Tue, 18 Feb 2025 00:00:17 +0800
From: Haoxiang Li <haoxiang_li2024@....com>
To: sammy@...my.net,
	geert@...ux-m68k.org,
	zhengqi.arch@...edance.com,
	akpm@...ux-foundation.org,
	dave.hansen@...ux.intel.com,
	kevin.brodsky@....com
Cc: linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <haoxiang_li2024@....com>,
	stable@...r.kernel.org
Subject: [PATCH] m68k: sun3: Add check for __pgd_alloc()

Add check for the return value of __pgd_alloc() in
pgd_alloc() to prevent null pointer dereference.

Fixes: a9b3c355c2e6 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@....com>
---
 arch/m68k/include/asm/sun3_pgalloc.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index f1ae4ed890db..80afc3a18724 100644
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -44,8 +44,10 @@ static inline pgd_t * pgd_alloc(struct mm_struct *mm)
 	pgd_t *new_pgd;
 
 	new_pgd = __pgd_alloc(mm, 0);
-	memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
-	memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
+	if (likely(new_pgd != NULL)) {
+		memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
+		memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
+	}
 	return new_pgd;
 }
 
-- 
2.25.1