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m68k: sun3: add check for __pgd_alloc()

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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@163.com
Fixes: a9b3c355c2 ("asm-generic: pgalloc: provide generic __pgd_{alloc,free}")
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Sam Creasey <sammy@sammy.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Haoxiang Li
2025-02-18 00:00:17 +08:00
committed by Andrew Morton
parent 349db086a6
commit 7277dd0a0b
1 changed files with 4 additions and 2 deletions
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6
arch/m68k/include/asm/sun3_pgalloc.h
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@@ -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;
}