linux-kernel - [PATCH] x86/fpu: Fix get_xsave_addr which returns error pointer to KVM

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Date:	Fri,  6 Nov 2015 17:00:23 +0800
From:	Huaitong Han <huaitong.han@...el.com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Cc:	dave.hansen@...el.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, Huaitong Han <huaitong.han@...el.com>
Subject: [PATCH] x86/fpu: Fix get_xsave_addr which returns error pointer to KVM

when KVM uses the get_xsave_addr, xsave parameter belongs to guest vcpu, if
xsave is replaced with current task (host) xsave, get_xsave_addr will return error
xsave addr to KVM.

Signed-off-by: Huaitong Han <huaitong.han@...el.com>
---
 arch/x86/kernel/fpu/xstate.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 62fc001..2c4ac07 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -402,7 +402,6 @@ void *get_xsave_addr(struct xregs_state *xsave, int xstate_feature)
 	if (!boot_cpu_has(X86_FEATURE_XSAVE))
 		return NULL;
 
-	xsave = &current->thread.fpu.state.xsave;
 	/*
 	 * We should not ever be requesting features that we
 	 * have not enabled.  Remember that pcntxt_mask is
-- 
2.4.3

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