From: Avi Kivity <avi@qumranet.com>
Date: Sat, 30 Dec 2006 00:49:58 +0000 (-0800)
Subject: [PATCH] KVM: Fix oops on oom
X-Git-Tag: firefly_0821_release~31692
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=55a54f79e091d52c3c2835985c347ea4d2e1c21f;p=firefly-linux-kernel-4.4.55.git

[PATCH] 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@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 0e618bcfe1da..973544553cba 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -245,7 +245,8 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 	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);
 		}