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LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset()

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commit ee084fa96123ede8b0563a1b5a9b23adc43cd50d upstream.

ERROR INFO:

CPU 25 Unable to handle kernel paging request at virtual address 0x0
         ...
 Call Trace:
 [<900000000023c30c>] huge_pte_offset+0x3c/0x58
 [<900000000057fd4c>] hugetlb_follow_page_mask+0x74/0x438
 [<900000000051fee8>] __get_user_pages+0xe0/0x4c8
 [<9000000000522414>] faultin_page_range+0x84/0x380
 [<9000000000564e8c>] madvise_vma_behavior+0x534/0xa48
 [<900000000056689c>] do_madvise+0x1bc/0x3e8
 [<9000000000566df4>] sys_madvise+0x24/0x38
 [<90000000015b9e88>] do_syscall+0x78/0x98
 [<9000000000221f18>] handle_syscall+0xb8/0x158

In some cases, pmd may be NULL and rely on NULL as the return value for
processing, so it is necessary to determine this situation here.

Cc: stable@vger.kernel.org
Fixes: bd51834d1cf6 ("LoongArch: Return NULL from huge_pte_offset() for invalid PMD")
Signed-off-by: Tianyang Zhang <zhangtianyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tianyang Zhang
2025-05-30 21:45:57 +08:00
committed by Greg Kroah-Hartman
parent 099cfcb98f
commit b427d98d55
1 changed files with 2 additions and 1 deletions
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3
arch/loongarch/mm/hugetlbpage.c
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@@ -47,7 +47,8 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
pmd = pmd_offset(pud, addr); pmd = pmd_offset(pud, addr);
} }
} }
return pmd_none(pmdp_get(pmd)) ? NULL : (pte_t *) pmd;
return (!pmd || pmd_none(pmdp_get(pmd))) ? NULL : (pte_t *) pmd;
} }
int pmd_huge(pmd_t pmd) int pmd_huge(pmd_t pmd)