bootutil_loader: Ensure that the load_addr is set

Ensure that the load_addr field contains a valid value by rejecting all
images that do not include the IMAGE_F_ROM_FIXED or IMAGE_F_RAM_LOAD
flags if the MCUBOOT_CHECK_HEADER_LOAD_ADDRESS check is enabled.

Signed-off-by: Tomasz Chyrowicz <tomasz.chyrowicz@nordicsemi.no>

Author: tomchy

boot/bootutil/src/bootutil_loader.c

@@ -132,6 +132,12 @@ boot_check_header_valid(struct boot_loader_state *state, int slot)
     }
 #endif
 
+#ifdef MCUBOOT_CHECK_HEADER_LOAD_ADDRESS
+    if (hdr->ih_flags & (IMAGE_F_ROM_FIXED | IMAGE_F_RAM_LOAD) == 0) {
+        return false;
+    }
+#endif
+
     return true;
 }