linux-kernel - [PATCH 3.12 66/82] x86/ldt: Further fix FPU emulation

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Message-Id: <a6ae4f41c292156455e720508062b69b81447de0.1440407339.git.jslaby@suse.cz>
Date:	Mon, 24 Aug 2015 11:09:26 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 66/82] x86/ldt: Further fix FPU emulation

From: Andy Lutomirski <luto@...nel.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 12e244f4b550498bbaf654a52f93633f7dde2dc7 upstream.

The previous fix confused a selector with a segment prefix.  Fix it.

Compile-tested only.

Cc: stable@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
Signed-off-by: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/math-emu/get_address.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
index d13cab2aec45..8300db71c2a6 100644
--- a/arch/x86/math-emu/get_address.c
+++ b/arch/x86/math-emu/get_address.c
@@ -157,7 +157,7 @@ static long pm_address(u_char FPU_modrm, u_char segment,
 		addr->selector = PM_REG_(segment);
 	}
 
-	descriptor = FPU_get_ldt_descriptor(segment);
+	descriptor = FPU_get_ldt_descriptor(addr->selector);
 	base_address = SEG_BASE_ADDR(descriptor);
 	address = base_address + offset;
 	limit = base_address
-- 
2.5.0

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