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[PULL,v2,04/13] migration: process_incoming_migration_co(): fix reporting s->error

Message ID 20240508233541.2403-5-farosas@suse.de
State New
Headers show
Series [PULL,v2,01/13] migration/ram.c: API Conversion qemu_mutex_lock(), and qemu_mutex_unlock() to WITH_QEMU_LOCK_GUARD macro | expand

Commit Message

Fabiano Rosas May 8, 2024, 11:35 p.m. UTC 
From: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>

It's bad idea to leave critical section with error object freed, but
s->error still set, this theoretically may lead to use-after-free
crash. Let's avoid it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 migration/migration.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/migration/migration.c b/migration/migration.c
index 0d26db47f7..b307a4bc59 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -784,6 +784,7 @@  process_incoming_migration_co(void *opaque)
         if (migrate_has_error(s)) {
             WITH_QEMU_LOCK_GUARD(&s->error_mutex) {
                 error_report_err(s->error);
+                s->error = NULL;
             }
         }
         error_report("load of migration failed: %s", strerror(-ret));