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-rw-r--r--hw/core/loader.c4
-rw-r--r--hw/core/machine.c2
2 files changed, 5 insertions, 1 deletions
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 052a0fd719..19edb928e9 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -1164,9 +1164,13 @@ static void rom_reset(void *unused)
         if (rom->mr) {
             void *host = memory_region_get_ram_ptr(rom->mr);
             memcpy(host, rom->data, rom->datasize);
+            memset(host + rom->datasize, 0, rom->romsize - rom->datasize);
         } else {
             address_space_write_rom(rom->as, rom->addr, MEMTXATTRS_UNSPECIFIED,
                                     rom->data, rom->datasize);
+            address_space_set(rom->as, rom->addr + rom->datasize, 0,
+                              rom->romsize - rom->datasize,
+                              MEMTXATTRS_UNSPECIFIED);
         }
         if (rom->isrom) {
             /* rom needs to be written only once */
diff --git a/hw/core/machine.c b/hw/core/machine.c
index debcdc0e70..d856485cb4 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -1091,7 +1091,7 @@ MemoryRegion *machine_consume_memdev(MachineState *machine,
 {
     MemoryRegion *ret = host_memory_backend_get_memory(backend);
 
-    if (memory_region_is_mapped(ret)) {
+    if (host_memory_backend_is_mapped(backend)) {
         error_report("memory backend %s can't be used multiple times.",
                      object_get_canonical_path_component(OBJECT(backend)));
         exit(EXIT_FAILURE);