From: Peng Hao <peng.h...@zte.com.cn>
[ Upstream commit bf7d28c53453ea904584960de55e33e03b9d93b1 ]
Using sizeof(pointer) for determining the size of a memset() only works
when the size of the pointer and the size of type to which it points are
the same. For pte_t this is only true for 64bit and 32bit-NONPAE. On 32bit
PAE systems this is wrong as the pointer size is 4 byte but the PTE entry
is 8 bytes. It's actually not a real world issue as this code depends on
64bit, but it's wrong nevertheless.
Use sizeof(*p) for correctness sake.
Fixes: aad983913d77 ("x86/mm/encrypt: Simplify sme_populate_pgd() and
sme_populate_pgd_large()")
Signed-off-by: Peng Hao <peng.h...@zte.com.cn>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: dave.han...@linux.intel.com
Cc: pet...@infradead.org
Cc: l...@kernel.org
Link:
https://lkml.kernel.org/r/1546065252-97996-1-git-send-email-peng.h...@zte.com.cn
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
arch/x86/mm/mem_encrypt_identity.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/mem_encrypt_identity.c
b/arch/x86/mm/mem_encrypt_identity.c
index a19ef1a416ff..4aa9b1480866 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/mm/mem_encrypt_identity.c
@@ -158,8 +158,8 @@ static void __init sme_populate_pgd(struct
sme_populate_pgd_data *ppd)
pmd = pmd_offset(pud, ppd->vaddr);
if (pmd_none(*pmd)) {
pte = ppd->pgtable_area;
- memset(pte, 0, sizeof(pte) * PTRS_PER_PTE);
- ppd->pgtable_area += sizeof(pte) * PTRS_PER_PTE;
+ memset(pte, 0, sizeof(*pte) * PTRS_PER_PTE);
+ ppd->pgtable_area += sizeof(*pte) * PTRS_PER_PTE;
set_pmd(pmd, __pmd(PMD_FLAGS | __pa(pte)));
}
--
2.19.1
