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From dc37b3a1cd7c01dfccf9459a973694cee266957f Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Sat, 11 Jan 2014 17:59:59 +0100
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Subject: [PATCH 09/22] fix double free the memslot in kvm_set_phys_mem
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RH-Author: Laszlo Ersek <lersek@redhat.com>
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Message-id: <1389463208-6278-10-git-send-email-lersek@redhat.com>
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Patchwork-id: 56622
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 09/18] fix double free the memslot in kvm_set_phys_mem
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Bugzilla: 1032346
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Amos Kong <akong@redhat.com>
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RH-Acked-by: Andrew Jones <drjones@redhat.com>
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From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
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Luiz Capitulino reported that guest refused to boot and qemu
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complained with:
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kvm_set_phys_mem: error unregistering overlapping slot: Invalid argument
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It is caused by commit 235e8982ad that did double free for the memslot
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so that the second one raises the -EINVAL error
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Fix it by reset memory size only if it is needed
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Reported-by: Luiz Capitulino <lcapitulino@redhat.com>
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Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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(cherry picked from commit 651eb0f41b793021f7de672de78892def5819fb9)
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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---
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kvm-all.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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kvm-all.c | 3 ++-
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1 files changed, 2 insertions(+), 1 deletions(-)
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diff --git a/kvm-all.c b/kvm-all.c
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index 42c71b9..16e4f65 100644
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--- a/kvm-all.c
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+++ b/kvm-all.c
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@@ -208,7 +208,8 @@ static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
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if (s->migration_log) {
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mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
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}
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- if (mem.flags & KVM_MEM_READONLY) {
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+
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+ if (slot->memory_size && mem.flags & KVM_MEM_READONLY) {
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/* Set the slot size to 0 before setting the slot to the desired
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* value. This is needed based on KVM commit 75d61fbc. */
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mem.memory_size = 0;
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--
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1.7.1
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