Snap for 4752322 from 94f7a87510138ac7b061611b181fa6e995d41764 to pi-release

Change-Id: I70e5251c6edc8da691072e47887deb4306ef4010
diff --git a/linker/linker_namespaces.h b/linker/linker_namespaces.h
index 03520d7..cd8b09d 100644
--- a/linker/linker_namespaces.h
+++ b/linker/linker_namespaces.h
@@ -54,6 +54,9 @@
   }
 
   bool is_accessible(const char* soname) const {
+    if (soname == nullptr) {
+      return false;
+    }
     return allow_all_shared_libs_ || shared_lib_sonames_.find(soname) != shared_lib_sonames_.end();
   }