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migration: avoid segmentfault when take a snapshot of a VM which being migrated

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During an active background migration, snapshot will trigger a
segmentfault. As snapshot clears the "current_migration" struct
and updates "to_dst_file" before it finds out that there is a
migration task, Migration accesses the null pointer in
"current_migration" struct and qemu crashes eventually.

Signed-off-by: Jia Lina <jialina01@baidu.com>
Signed-off-by: Chai Wen <chaiwen@baidu.com>
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Message-Id: <20181026083620.10172-1-jialina01@baidu.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Jia Lina 2018-10-26 16:36:20 +08:00 • committed by Dr. David Alan Gilbert
parent ea3b23e5ff
commit 3d63da16fb
3 changed files with 14 additions and 9 deletions
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2
migration/migration.c
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@ -742,7 +742,7 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
* Return true if we're already in the middle of a migration
* (i.e. any of the active or setup states)
*/
static bool migration_is_setup_or_active(int state)
bool migration_is_setup_or_active(int state)
{
switch (state) {
case MIGRATION_STATUS_ACTIVE: