linux-kernel - [PATCH] KVM: NULL return of kvmppc_mmu_hpte_cache

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Message-Id: <1385979718-26218-1-git-send-email-yizhouzhou@ict.ac.cn>
Date:	Mon,  2 Dec 2013 18:21:58 +0800
From:	Zhouyi Zhou <zhouzhouyi@...il.com>
To:	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<kvm-ppc@...r.kernel.org>, Alexander Graf <agraf@...e.de>,
	<paulus@...ba.org>
Cc:	Zhouyi Zhou <yizhouzhou@....ac.cn>
Subject: [PATCH] KVM: NULL return of kvmppc_mmu_hpte_cache_next should be handled

NULL return of kvmppc_mmu_hpte_cache_next should be handled

Signed-off-by: Zhouyi Zhou <yizhouzhou@....ac.cn>
---
 arch/powerpc/kvm/book3s_32_mmu_host.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_32_mmu_host.c b/arch/powerpc/kvm/book3s_32_mmu_host.c
index 3a0abd2..5fac89d 100644
--- a/arch/powerpc/kvm/book3s_32_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_32_mmu_host.c
@@ -243,6 +243,11 @@ next_pteg:
 	/* Now tell our Shadow PTE code about the new page */
 
 	pte = kvmppc_mmu_hpte_cache_next(vcpu);
+	if (!pte) {
+		kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
+		r = -EAGAIN;
+		goto out;
+	}
 
 	dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
 		    orig_pte->may_write ? 'w' : '-',
-- 
1.7.10.4

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