[Qemu-devel] [PATCH] migration: catch unknown flags in ram_load

[Peter Lieven]

if a saved vm has unknown flags in the memory data qemu
currently simply ignores this flag and continues which
yields in an unpredictable result.

this patch catches all unknown flags and
aborts the loading of the vm.

CC: qemu-sta...@nongnu.org
Signed-off-by: Peter Lieven <p...@kamp.de>
---
 arch_init.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 995f56d..582b716 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -1084,9 +1084,7 @@ static int ram_load(QEMUFile *f, void *opaque, int 
version_id)
 
                 total_ram_bytes -= length;
             }
-        }
-
-        if (flags & RAM_SAVE_FLAG_COMPRESS) {
+        } else if (flags & RAM_SAVE_FLAG_COMPRESS) {
             void *host;
             uint8_t ch;
 
@@ -1121,6 +1119,9 @@ static int ram_load(QEMUFile *f, void *opaque, int 
version_id)
             }
         } else if (flags & RAM_SAVE_FLAG_HOOK) {
             ram_control_load_hook(f, flags);
+        } else if (!(flags & RAM_SAVE_FLAG_EOS)) {
+            ret = -EINVAL;
+            goto done;
         }
         error = qemu_file_get_error(f);
         if (error) {
-- 
1.7.9.5