linux-kernel - [PATCH 3.19 030/177] ARM: KVM: Fix size check in __coherent_cache_guest

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Message-Id: <20150502190120.991111849@linuxfoundation.org>
Date:	Sat,  2 May 2015 21:00:52 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jan Kiszka <jan.kiszka@...mens.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Shannon Zhao <shannon.zhao@...aro.org>
Subject: [PATCH 3.19 030/177] ARM: KVM: Fix size check in __coherent_cache_guest_page

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

------------------

From: Jan Kiszka <jan.kiszka@...mens.com>

commit a050dfb21cc22ac0c666d52531040c1bc48184cc upstream.

The check is supposed to catch page-unaligned sizes, not the inverse.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/include/asm/kvm_mmu.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -186,7 +186,7 @@ static inline void __coherent_cache_gues
 
 	bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached;
 
-	VM_BUG_ON(size & PAGE_MASK);
+	VM_BUG_ON(size & ~PAGE_MASK);
 
 	if (!need_flush && !icache_is_pipt())
 		goto vipt_cache;


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