linux-kernel - [PATCH 5.13 060/175] MIPS: check return value of pgtable_pmd_page

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Date:   Tue, 10 Aug 2021 19:29:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Joshua Kinard <kumba@...too.org>,
        Huang Pei <huangpei@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 060/175] MIPS: check return value of pgtable_pmd_page_ctor

From: Huang Pei <huangpei@...ngson.cn>

[ Upstream commit 6aa32467299e9e12280a6aec9dbc21bf2db830b0 ]

+. According to Documentation/vm/split_page_table_lock, handle failure
of pgtable_pmd_page_ctor

+. Use GFP_KERNEL_ACCOUNT instead of GFP_KERNEL|__GFP_ACCOUNT

+. Adjust coding style

Fixes: ed914d48b6a1 ("MIPS: add PMD table accounting into MIPS')
Reported-by: Joshua Kinard <kumba@...too.org>
Signed-off-by: Huang Pei <huangpei@...ngson.cn>
Reviewed-by: Joshua Kinard <kumba@...too.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/include/asm/pgalloc.h | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index d0cf997b4ba8..139b4050259f 100644
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -59,15 +59,20 @@ do {							\
 
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 {
-	pmd_t *pmd = NULL;
+	pmd_t *pmd;
 	struct page *pg;
 
-	pg = alloc_pages(GFP_KERNEL | __GFP_ACCOUNT, PMD_ORDER);
-	if (pg) {
-		pgtable_pmd_page_ctor(pg);
-		pmd = (pmd_t *)page_address(pg);
-		pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
+	pg = alloc_pages(GFP_KERNEL_ACCOUNT, PMD_ORDER);
+	if (!pg)
+		return NULL;
+
+	if (!pgtable_pmd_page_ctor(pg)) {
+		__free_pages(pg, PMD_ORDER);
+		return NULL;
 	}
+
+	pmd = (pmd_t *)page_address(pg);
+	pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
 	return pmd;
 }
 
-- 
2.30.2