1 files changed, 3 insertions, 1 deletions
diff --git a/system/physmem.c b/system/physmem.c
index f498572fc8..311011156c 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -3231,8 +3231,10 @@ static inline MemTxResult address_space_write_rom_internal(AddressSpace *as,
             }
         }
         len -= l;
-        buf += l;
         addr += l;
+        if (buf) {
+            buf += l;
+        }
     }
     return MEMTX_OK;
 }