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[PULL 02/27] savevm: Fix memory leak of vmstate_configuration
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PULL 02/27] savevm: Fix memory leak of vmstate_configuration |
Date: |
Thu, 4 Feb 2021 16:39:34 +0000 |
From: Jinhao Gao <gaojinhao@huawei.com>
When VM migrate VMState of configuration, the fields(name and capabilities)
of configuration having a flag of VMS_ALLOC need to allocate memory. If the
src doesn't free memory of capabilities in SaveState after save VMState of
configuration, or the dst doesn't free memory of name and capabilities in post
load of configuration, it may result in memory leak of name and capabilities.
We free memory in configuration_post_save and configuration_post_load func,
which prevents memory leak.
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Jinhao Gao <gaojinhao@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20201231061020.828-3-gaojinhao@huawei.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
migration/savevm.c | 31 +++++++++++++++++++++++++++----
1 file changed, 27 insertions(+), 4 deletions(-)
diff --git a/migration/savevm.c b/migration/savevm.c
index 4f3b69ecfc..d1e6aaed60 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -315,6 +315,16 @@ static int configuration_pre_save(void *opaque)
return 0;
}
+static int configuration_post_save(void *opaque)
+{
+ SaveState *state = opaque;
+
+ g_free(state->capabilities);
+ state->capabilities = NULL;
+ state->caps_count = 0;
+ return 0;
+}
+
static int configuration_pre_load(void *opaque)
{
SaveState *state = opaque;
@@ -365,24 +375,36 @@ static int configuration_post_load(void *opaque, int
version_id)
{
SaveState *state = opaque;
const char *current_name = MACHINE_GET_CLASS(current_machine)->name;
+ int ret = 0;
if (strncmp(state->name, current_name, state->len) != 0) {
error_report("Machine type received is '%.*s' and local is '%s'",
(int) state->len, state->name, current_name);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (state->target_page_bits != qemu_target_page_bits()) {
error_report("Received TARGET_PAGE_BITS is %d but local is %d",
state->target_page_bits, qemu_target_page_bits());
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (!configuration_validate_capabilities(state)) {
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return 0;
+out:
+ g_free((void *)state->name);
+ state->name = NULL;
+ state->len = 0;
+ g_free(state->capabilities);
+ state->capabilities = NULL;
+ state->caps_count = 0;
+
+ return ret;
}
static int get_capability(QEMUFile *f, void *pv, size_t size,
@@ -516,6 +538,7 @@ static const VMStateDescription vmstate_configuration = {
.pre_load = configuration_pre_load,
.post_load = configuration_post_load,
.pre_save = configuration_pre_save,
+ .post_save = configuration_post_save,
.fields = (VMStateField[]) {
VMSTATE_UINT32(len, SaveState),
VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, len),
--
2.29.2
- [PULL 00/27] migration queue, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 02/27] savevm: Fix memory leak of vmstate_configuration,
Dr. David Alan Gilbert (git) <=
- [PULL 04/27] migration/qemu-file: Fix maybe uninitialized on qemu_get_buffer_in_place(), Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 01/27] spapr_pci: Fix memory leak of vmstate_spapr_pci, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 03/27] vmstate: Fix memory leak in vmstate_handle_alloc(), Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 05/27] migration: introduce 'background-snapshot' migration capability, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 06/27] migration: introduce UFFD-WP low-level interface helpers, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 07/27] migration: support UFFD write fault processing in ram_save_iterate(), Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 08/27] migration: implementation of background snapshot thread, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 09/27] migration: introduce 'userfaultfd-wrlat.py' script, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 10/27] migration: Fix migrate-set-parameters argument validation, Dr. David Alan Gilbert (git), 2021/02/04
- [PULL 11/27] migration: Clean up signed vs. unsigned XBZRLE cache-size, Dr. David Alan Gilbert (git), 2021/02/04