[PULL 3/9] migration: Plug memory leaks after migrate_set_error()

[Peter Xu <peterx@redhat.com>]

From: Markus Armbruster <armbru@redhat.com>

migrate_set_error(s, err) stores a copy of @err in @s.  The original
@err is not freed.  Most callers free it immediately.  Some callers
free it later, or pass it on.  And some leak it.  Fix those.

Perhaps migrate_set_error(s, err) should take ownership of @err.  The
callers that free it immediately would become simpler, and avoid a
copy and a deallocation.  The others would have to pass
error_copy(err).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Link: https://lore.kernel.org/r/20251115083500.2753895-2-armbru@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/cpr-exec.c | 3 ++-
 migration/multifd.c  | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/migration/cpr-exec.c b/migration/cpr-exec.c
index d284f6e734..0b8344a86f 100644
--- a/migration/cpr-exec.c
+++ b/migration/cpr-exec.c
@@ -159,11 +159,12 @@ static void cpr_exec_cb(void *opaque)
     error_report_err(error_copy(err));
     migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
     migrate_set_error(s, err);
+    error_free(err);
+    err = NULL;
 
     /* Note, we can go from state COMPLETED to FAILED */
     migration_call_notifiers(s, MIG_EVENT_PRECOPY_FAILED, NULL);
 
-    err = NULL;
     if (!migration_block_activate(&err)) {
         /* error was already reported */
         error_free(err);
diff --git a/migration/multifd.c b/migration/multifd.c
index 98873cee74..a529c399e4 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -964,6 +964,7 @@ bool multifd_send_setup(void)
 
         if (!multifd_new_send_channel_create(p, &local_err)) {
             migrate_set_error(s, local_err);
+            error_free(local_err);
             ret = -1;
         }
     }
@@ -988,6 +989,7 @@ bool multifd_send_setup(void)
         ret = multifd_send_state->ops->send_setup(p, &local_err);
         if (ret) {
             migrate_set_error(s, local_err);
+            error_free(local_err);
             goto err;
         }
         assert(p->iov);
-- 
2.50.1