linux-kernel - [tip:x86/pti] x86/efi: Free efi_pgd with free

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Message-ID: <tip-06ace26f4e6fcf747e890a39193be811777a048a@git.kernel.org>
Date:   Fri, 23 Mar 2018 12:21:54 -0700
From:   tip-bot for Waiman Long <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, dave.hansen@...ux.intel.com,
        longman@...hat.com, tglx@...utronix.de, mingo@...nel.org,
        hpa@...or.com, ard.biesheuvel@...aro.org
Subject: [tip:x86/pti] x86/efi: Free efi_pgd with free_pages()

Commit-ID:  06ace26f4e6fcf747e890a39193be811777a048a
Gitweb:     https://git.kernel.org/tip/06ace26f4e6fcf747e890a39193be811777a048a
Author:     Waiman Long <longman@...hat.com>
AuthorDate: Thu, 22 Mar 2018 15:18:53 -0400
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 23 Mar 2018 20:18:31 +0100

x86/efi: Free efi_pgd with free_pages()

The efi_pgd is allocated as PGD_ALLOCATION_ORDER pages and therefore must
also be freed as PGD_ALLOCATION_ORDER pages with free_pages().

Fixes: d9e9a6418065 ("x86/mm/pti: Allocate a separate user PGD")
Signed-off-by: Waiman Long <longman@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1521746333-19593-1-git-send-email-longman@redhat.com

---
 arch/x86/platform/efi/efi_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index c310a8284358..f9cfbc0d1f33 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -227,7 +227,7 @@ int __init efi_alloc_page_tables(void)
 	if (!pud) {
 		if (CONFIG_PGTABLE_LEVELS > 4)
 			free_page((unsigned long) pgd_page_vaddr(*pgd));
-		free_page((unsigned long)efi_pgd);
+		free_pages((unsigned long)efi_pgd, PGD_ALLOCATION_ORDER);
 		return -ENOMEM;
 	}