linux-kernel - [PATCHv2 1/6] x86/vdso: unmap vdso blob on vvar mapping failure

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Date:	Wed, 29 Jun 2016 13:57:31 +0300
From:	Dmitry Safonov <dsafonov@...tuozzo.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<0x7f454c46@...il.com>, <linux-mm@...ck.org>, <mingo@...hat.com>,
	<luto@...capital.net>, <gorcunov@...nvz.org>,
	<xemul@...tuozzo.com>, <oleg@...hat.com>,
	Dmitry Safonov <dsafonov@...tuozzo.com>,
	Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>
Subject: [PATCHv2 1/6] x86/vdso: unmap vdso blob on vvar mapping failure

If remapping of vDSO blob failed on vvar mapping,
we need to unmap previously mapped vDSO blob.

Cc: Andy Lutomirski <luto@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Pavel Emelyanov <xemul@...tuozzo.com>
Cc: x86@...nel.org
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
---
 arch/x86/entry/vdso/vma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 3329844e3c43..387028e6755d 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -238,7 +238,7 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr)
 
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
-		goto up_fail;
+		do_munmap(mm, text_start, image->size);
 	}
 
 up_fail:
-- 
2.9.0