Reviewed By: sblackshear Differential Revision: D5970391 fbshipit-source-id: 6148094master
Jeremy Dubreil
7 years ago
committed by
Facebook Github Bot
parent
4255d918ad
commit
923a15fa60
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(*
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* Copyright (c) 2017 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*)
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module L = Logging
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module MF = MarkupFormatter
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module CallSites = AbstractDomain.FiniteSet (CallSite)
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module Domain = AbstractDomain.Map (AccessPath) (CallSites)
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module TransferFunctions (CFG : ProcCfg.S) = struct
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module CFG = CFG
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module Domain = Domain
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type extras = Specs.summary
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let is_instance_method callee_pname =
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if Typ.Procname.is_java callee_pname then not (Typ.Procname.java_is_static callee_pname)
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else
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Option.exists
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~f:(fun attributes ->
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attributes.ProcAttributes.is_objc_instance_method
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|| attributes.ProcAttributes.is_cpp_instance_method)
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(Specs.proc_resolve_attributes callee_pname)
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let report_nullable_dereference ap call_sites {ProcData.pdesc; extras} loc =
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let pname = Procdesc.get_proc_name pdesc in
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let annotation = Localise.nullable_annotation_name pname in
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let issue_kind = IssueType.nullable_dereference.unique_id in
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let call_site =
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try CallSites.min_elt call_sites
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with Not_found ->
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L.(die InternalError)
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"Expecting a least one element in the set of call sites when analyzing %a"
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Typ.Procname.pp pname
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in
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let message =
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Format.asprintf
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"Variable %a is indirectly annotated with %a (source %a) and is dereferenced without being checked for null"
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(MF.wrap_monospaced AccessPath.pp) ap MF.pp_monospaced annotation
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(MF.wrap_monospaced CallSite.pp) call_site
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in
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let exn = Exceptions.Checkers (issue_kind, Localise.verbatim_desc message) in
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let summary = extras in
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let trace =
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let with_origin_site =
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let callee_pname = CallSite.pname call_site in
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match Specs.proc_resolve_attributes callee_pname with
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| None
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-> []
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| Some attributes
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-> let description =
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Format.asprintf "definition of %s" (Typ.Procname.get_method callee_pname)
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in
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let trace_element =
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Errlog.make_trace_element 1 attributes.ProcAttributes.loc description []
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in
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[trace_element]
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in
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let with_assignment_site =
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let call_site_loc = CallSite.loc call_site in
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if Location.equal call_site_loc loc then with_origin_site
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else
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let trace_element =
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Errlog.make_trace_element 0 call_site_loc "assignment of the nullable value" []
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in
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trace_element :: with_origin_site
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in
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let dereference_site =
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let description = Format.asprintf "deference of %a" AccessPath.pp ap in
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Errlog.make_trace_element 0 loc description []
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in
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dereference_site :: with_assignment_site
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in
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Reporting.log_error summary ~loc ~ltr:trace exn
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let exec_instr (astate: Domain.astate) proc_data _ (instr: HilInstr.t) : Domain.astate =
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match instr with
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| Call (Some ret_var, Direct callee_pname, _, _, loc)
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when Annotations.pname_has_return_annot callee_pname
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~attrs_of_pname:Specs.proc_resolve_attributes Annotations.ia_is_nullable
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-> let call_site = CallSite.make callee_pname loc in
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Domain.add (ret_var, []) (CallSites.singleton call_site) astate
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| Call (_, Direct callee_pname, (HilExp.AccessPath receiver) :: _, _, loc)
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when is_instance_method callee_pname -> (
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match Domain.find_opt receiver astate with
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| None
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-> astate
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| Some call_sites
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-> report_nullable_dereference receiver call_sites proc_data loc ;
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Domain.remove receiver astate )
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| Call (Some ret_var, _, _, _, _)
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-> Domain.remove (ret_var, []) astate
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| Assign (lhs, _, loc) when Domain.mem lhs astate
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-> report_nullable_dereference lhs (Domain.find lhs astate) proc_data loc ;
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Domain.remove lhs astate
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| Assign (lhs, HilExp.AccessPath rhs, _) when Domain.mem rhs astate
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-> Domain.add lhs (Domain.find rhs astate) astate
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| Assign (lhs, _, _)
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-> Domain.remove lhs astate
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| Assume (HilExp.AccessPath ap, _, _, _)
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-> Domain.remove ap astate
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| Assume (HilExp.BinaryOperator (Binop.Ne, HilExp.AccessPath ap, exp), _, _, _)
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when HilExp.is_null_literal exp
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-> Domain.remove ap astate
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| _
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-> astate
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end
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module Analyzer =
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AbstractInterpreter.Make (ProcCfg.Exceptional) (LowerHil.MakeDefault (TransferFunctions))
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let checker {Callbacks.summary; proc_desc; tenv} =
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let initial = (Domain.empty, IdAccessPathMapDomain.empty) in
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let proc_data = ProcData.make proc_desc tenv summary in
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ignore (Analyzer.compute_post proc_data ~initial ~debug:false) ;
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summary
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@ -0,0 +1,10 @@
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(*
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* Copyright (c) 2017 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*)
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val checker : Callbacks.proc_callback_t
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@ -0,0 +1,55 @@
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/*
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* Copyright (c) 2017 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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||||
* of patent rights can be found in the PATENTS file in the same directory.
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*/
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bool star();
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class T {
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public:
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int* _Nullable mayReturnNullPointer() {
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if (star()) {
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return nullptr;
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} else {
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return new int;
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}
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}
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public:
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T* _Nullable mayReturnNullObject() {
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if (star()) {
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return nullptr;
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} else {
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return this;
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}
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}
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public:
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void doSomething() {}
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};
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void assignNullableValueBad(T* t) {
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int* p = t->mayReturnNullPointer();
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*p = 42;
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}
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void FP_reAssigningNullableValueOk(T* t) {
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int* p = t->mayReturnNullPointer();
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p = new int;
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*p = 42;
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}
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void callMethodOnNullableObjectBad(T* t) {
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t->mayReturnNullObject()->doSomething();
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}
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void callMethodOnNullableObjectOk(T* t) {
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T* p = t->mayReturnNullObject();
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if (p != nullptr) {
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p->doSomething();
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}
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}
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