[PULL 04/34] migration/ram: add additional check

[peterx@redhat.com]

From: Maksim Davydov <davydov-max@yandex-team.ru>

If a migration stream is broken, the address and flag reading can return
zero. Thus, an irrelevant flag error will be returned instead of EIO.
It can be fixed by additional check after the reading.

Signed-off-by: Maksim Davydov <davydov-max@yandex-team.ru>
Link: https://lore.kernel.org/r/20240304144203.158477-1-davydov-max@yandex-team.ru
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/ram.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index 003c28e133..2cd936d9ce 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4214,6 +4214,12 @@ static int ram_load_precopy(QEMUFile *f)
         i++;
 
         addr = qemu_get_be64(f);
+        ret = qemu_file_get_error(f);
+        if (ret) {
+            error_report("Getting RAM address failed");
+            break;
+        }
+
         flags = addr & ~TARGET_PAGE_MASK;
         addr &= TARGET_PAGE_MASK;
 
-- 
2.44.0