[PATCH] memory: Do not allow subregion out of the parent region range

[Philippe Mathieu-Daudé]

If a subregion is mapped out of the parent region range, it
will never get accessed. Since this is a bug, abort to help
the developer notice the mistake.

Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
 memory.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/memory.c b/memory.c
index 06484c2bff..61f355dcd5 100644
--- a/memory.c
+++ b/memory.c
@@ -2390,6 +2390,7 @@ static void 
memory_region_add_subregion_common(MemoryRegion *mr,
 {
     assert(!subregion->container);
     subregion->container = mr;
+    assert(offset + memory_region_size(subregion) <= memory_region_size(mr));
     subregion->addr = offset;
     memory_region_update_container_subregions(subregion);
 }
-- 
2.21.0