linux-kernel - [PATCH 8/8] KVM: Fix oops on oom

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Message-Id: <20061228101517.AE36C2500F7@il.qumranet.com>
Date:	Thu, 28 Dec 2006 10:15:17 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH 8/8] KVM: Fix oops on oom

__free_page() doesn't like a NULL argument, so check before calling it.  A
NULL can only happen if memory is exhausted during allocation of a memory
slot.

Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -245,7 +245,8 @@ static void kvm_free_physmem_slot(struct
 	if (!dont || free->phys_mem != dont->phys_mem)
 		if (free->phys_mem) {
 			for (i = 0; i < free->npages; ++i)
-				__free_page(free->phys_mem[i]);
+				if (free->phys_mem[i])
+					__free_page(free->phys_mem[i]);
 			vfree(free->phys_mem);
 		}
 
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