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From:   Jiang Biao <jiang.biao2@zte.com.cn>
To:     tglx@linutronix.de, mingo@redhat.com
Cc:     dave.hansen@linux.intel.com, luto@kernel.org, hpa@zytor.com,
        x86@kernel.org, albcamus@gmail.com, linux-kernel@vger.kernel.org,
        zhong.weidong@zte.com.cn, jiang.biao2@zte.com.cn
Subject: [PATCH v3 1/2] x86/pti: check the return value of pti_user_pagetable_walk_p4d
Date:   Wed, 18 Jul 2018 07:29:22 +0800
Message-Id: <1531870163-39088-1-git-send-email-jiang.biao2@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

pti_user_pagetable_walk_p4d() may return NULL, we should check the
return value to avoid NULL pointer dereference. And add warning
for fail allocation where NULL returned.

Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn>
---
 arch/x86/mm/pti.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 4d418e7..5c33a16 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -176,7 +176,7 @@ static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
 
 	if (pgd_none(*pgd)) {
 		unsigned long new_p4d_page = __get_free_page(gfp);
-		if (!new_p4d_page)
+		if (WARN_ON(!new_p4d_page))
 			return NULL;
 
 		set_pgd(pgd, __pgd(_KERNPG_TABLE | __pa(new_p4d_page)));
@@ -195,9 +195,12 @@ static p4d_t *pti_user_pagetable_walk_p4d(unsigned long address)
 static pmd_t *pti_user_pagetable_walk_pmd(unsigned long address)
 {
 	gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
-	p4d_t *p4d = pti_user_pagetable_walk_p4d(address);
 	pud_t *pud;
 
+	p4d_t *p4d = pti_user_pagetable_walk_p4d(address);
+	if (!p4d)
+		return NULL;	
+
 	BUILD_BUG_ON(p4d_large(*p4d) != 0);
 	if (p4d_none(*p4d)) {
 		unsigned long new_pud_page = __get_free_page(gfp);
@@ -354,6 +357,9 @@ static void __init pti_clone_p4d(unsigned long addr)
 	pgd_t *kernel_pgd;
 
 	user_p4d = pti_user_pagetable_walk_p4d(addr);
+	if (!user_p4d)
+		return;	
+
 	kernel_pgd = pgd_offset_k(addr);
 	kernel_p4d = p4d_offset(kernel_pgd, addr);
 	*user_p4d = *kernel_p4d;
-- 
2.7.4