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

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Message-ID: <1464786697-20639-2-git-send-email-dsafonov@virtuozzo.com>
Date:	Wed, 1 Jun 2016 16:11:32 +0300
From:	Dmitry Safonov <dsafonov@...tuozzo.com>
To:	<linux-kernel@...r.kernel.org>, <mingo@...hat.com>
CC:	<luto@...capital.net>, <tglx@...utronix.de>, <hpa@...or.com>,
	<x86@...nel.org>, <0x7f454c46@...il.com>, <oleg@...hat.com>,
	<gorcunov@...nvz.org>, <xemul@...tuozzo.com>,
	<khorenko@...tuozzo.com>, Dmitry Safonov <dsafonov@...tuozzo.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 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>
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:
-- 
2.8.2