File 0590-Eliminate-crash-in-dialyzer_dep.patch of Package erlang

From 937808d6dd2d0bd011173bc57479d9fdd750df82 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Thu, 1 Dec 2022 04:58:23 +0100
Subject: [PATCH] Eliminate crash in dialyzer_dep

Closes #6518
---
 lib/dialyzer/src/dialyzer_dep.erl             | 26 +++++++++++--------
 .../test/small_SUITE_data/src/gh_6518.erl     | 12 +++++++++
 2 files changed, 27 insertions(+), 11 deletions(-)
 create mode 100644 lib/dialyzer/test/small_SUITE_data/src/gh_6518.erl

diff --git a/lib/dialyzer/src/dialyzer_dep.erl b/lib/dialyzer/src/dialyzer_dep.erl
index c565a0a612..c869be76a3 100644
--- a/lib/dialyzer/src/dialyzer_dep.erl
+++ b/lib/dialyzer/src/dialyzer_dep.erl
@@ -124,22 +124,26 @@ traverse(Tree, Out, State, CurrentFun) ->
       {merge_outs([HdFuns, TlFuns]), State2};
     'fun' ->
       %% io:format("Entering fun: ~w\n", [cerl_trees:get_label(Tree)]),
+      OldNumRvals = state__num_rvals(State),
+      State1 = state__store_num_rvals(1, State),
       Body = cerl:fun_body(Tree),
       Label = cerl_trees:get_label(Tree),
-      State1 =
-	if CurrentFun =:= top -> 
-	    state__add_deps(top, output(set__singleton(Label)), State);
-	   true -> 
-	    O1 = output(set__singleton(CurrentFun)),
-	    O2 = output(set__singleton(Label)),
-	    TmpState = state__add_deps(Label, O1, State),
-	    state__add_deps(CurrentFun, O2,TmpState)
+      State2 =
+        if
+          CurrentFun =:= top ->
+            state__add_deps(top, output(set__singleton(Label)), State1);
+          true ->
+            O1 = output(set__singleton(CurrentFun)),
+            O2 = output(set__singleton(Label)),
+            TmpState = state__add_deps(Label, O1, State1),
+            state__add_deps(CurrentFun, O2, TmpState)
 	end,
       Vars = cerl:fun_vars(Tree),
       Out1 = bind_single(Vars, output(set__singleton(external)), Out),
-      {BodyFuns, State2} =
-        traverse(Body, Out1, State1, cerl_trees:get_label(Tree)),
-      {output(set__singleton(Label)), state__add_esc(BodyFuns, State2)};
+      {BodyFuns, State3} =
+        traverse(Body, Out1, State2, cerl_trees:get_label(Tree)),
+      State4 = state__store_num_rvals(OldNumRvals, State3),
+      {output(set__singleton(Label)), state__add_esc(BodyFuns, State4)};
     'let' ->
       Vars = cerl:let_vars(Tree),
       Arg = cerl:let_arg(Tree),
diff --git a/lib/dialyzer/test/small_SUITE_data/src/gh_6518.erl b/lib/dialyzer/test/small_SUITE_data/src/gh_6518.erl
new file mode 100644
index 0000000000..794548b37a
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/gh_6518.erl
@@ -0,0 +1,12 @@
+-module(gh_6518).
+-export([f/1]).
+
+f(X) ->
+    case
+        fun() ->
+                [ok || _ <- []]
+        end
+    of
+        _ ->
+            (Y = X)
+    end andalso Y.
-- 
2.35.3