The patch titled
Subject: m68k: sun3: add check for __pgd_alloc()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
m68k-sun3-add-check-for-__pgd_alloc.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/m68k-sun3-add-check-for-__pgd_alloc.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Haoxiang Li <haoxiang_li2024@xxxxxxx>
Subject: m68k: sun3: add check for __pgd_alloc()
Date: Tue, 18 Feb 2025 00:00:17 +0800
Add check for the return value of __pgd_alloc() in pgd_alloc() to prevent
null pointer dereference.
Link: https://lkml.kernel.org/r/20250217160017.2375536-1-haoxiang_li2024@xxxxxxx
Fixes: a9b3c355c2e6 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}")
Signed-off-by: Haoxiang Li <haoxiang_li2024@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Cc: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Sam Creasey <sammy@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/m68k/include/asm/sun3_pgalloc.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/m68k/include/asm/sun3_pgalloc.h~m68k-sun3-add-check-for-__pgd_alloc
+++ a/arch/m68k/include/asm/sun3_pgalloc.h
@@ -44,8 +44,10 @@ static inline pgd_t * pgd_alloc(struct m
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;
}
_
Patches currently in -mm which might be from haoxiang_li2024@xxxxxxx are
m68k-sun3-add-check-for-__pgd_alloc.patch
