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[Qemu-devel] [PATCH] savevm: fix corruption in vmstate_subsection_load()
From: |
Yoshiaki Tamura |
Subject: |
[Qemu-devel] [PATCH] savevm: fix corruption in vmstate_subsection_load(). |
Date: |
Tue, 14 Dec 2010 18:07:38 +0900 |
Although it's rare to happen in live migration, when the head of a
byte stream contains 0x05 which is the marker of subsection, the
loader gets corrupted because vmstate_subsection_load() continues even
the device doesn't require it. This patch adds a checker whether
subsection is needed, and skips following routines if not needed.
Signed-off-by: Yoshiaki Tamura <address@hidden>
---
savevm.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/savevm.c b/savevm.c
index d38f79e..72f6249 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1633,6 +1633,12 @@ static const VMStateDescription
*vmstate_get_subsection(const VMStateSubsection
static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque)
{
+ const VMStateSubsection *sub = vmsd->subsections;
+
+ if (!sub || !sub->needed) {
+ return 0;
+ }
+
while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
char idstr[256];
int ret;
@@ -1645,7 +1651,7 @@ static int vmstate_subsection_load(QEMUFile *f, const
VMStateDescription *vmsd,
idstr[len] = 0;
version_id = qemu_get_be32(f);
- sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
+ sub_vmsd = vmstate_get_subsection(sub, idstr);
if (sub_vmsd == NULL) {
return -ENOENT;
}
--
1.7.1.2
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