[Qemu-devel] [PATCH] migration: Guard ram_bytes_remaining against early call

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Calling ram_bytes_remaining during the early part of setup is unsafe
because the ram_state isn't yet initialised.

This can happen in the sequence:
   migrate
   migrate_cancel
   info migrate

if the migrate sticks trying to connect (e.g. to an unresponsive
destination due to the connect timeout).  Here 'info migrate' sees
a state of CANCELLING and so assumes the migrate has partially happened.

partial fix for:
RH bz: https://bugzilla.redhat.com/show_bug.cgi?id=1525899
Reported-by: Xianxian Wang <xianwang@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/ram.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 021d583b9b..cb1950f3eb 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -237,7 +237,8 @@ static RAMState *ram_state;
 
 uint64_t ram_bytes_remaining(void)
 {
-    return ram_state->migration_dirty_pages * TARGET_PAGE_SIZE;
+    return ram_state ? (ram_state->migration_dirty_pages * TARGET_PAGE_SIZE) :
+                       0;
 }
 
 MigrationStats ram_counters;
-- 
2.14.3