lib_manager: Add module id verification

Add verification of the module id passed as a parameter to the
lib_manager_get_mod_ctx function. Add error handling to the
lib_manager_free_module function.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Author: softwarecki

src/include/sof/lib_manager.h

@@ -145,7 +145,7 @@ static inline struct lib_manager_mod_ctx *lib_manager_get_mod_ctx(int module_id)
 	uint32_t lib_id = LIB_MANAGER_GET_LIB_ID(module_id);
 	struct ext_library *_ext_lib = ext_lib_get();
 
-	if (!_ext_lib)
+	if (!_ext_lib || lib_id >= LIB_MANAGER_MAX_LIBS)
 		return NULL;
 
 	return _ext_lib->desc[lib_id];

src/library_manager/lib_manager.c

@@ -386,6 +386,10 @@ int lib_manager_free_module(const uint32_t component_id)
 	tr_dbg(&lib_manager_tr, "mod_id: %#x", component_id);
 
 	mod = lib_manager_get_module_manifest(module_id);
+	if (!mod) {
+		tr_err(&lib_manager_tr, "failed to get module descriptor");
+		return -EINVAL;
+	}
 
 	if (module_is_llext(mod))
 		return llext_manager_free_module(component_id);