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File 2104-Correct-error-handling-for-list_to_integer-2.patch of Package erlang (Revision 15b24e456ec31eded623c8b8a9e37cc4)

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From 66fc4da8610eb4c0ddb2b17d248472432d7c7b7b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 27 Nov 2020 05:30:52 +0100
Subject: [PATCH] Correct error handling for list_to_integer/2

Passing in some atoms as base to list_to_integer/2 would not raise
a `badarg` exception. For example, `list_to_integer("10", true)`
would return the value 4.
---
 erts/emulator/beam/bif.c             | 12 ++++----
 erts/emulator/test/num_bif_SUITE.erl | 45 ++++++++++++++++------------
 2 files changed, 33 insertions(+), 24 deletions(-)

diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index 5beab81b98..4f1f114eba 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -3105,13 +3105,15 @@ BIF_RETTYPE list_to_integer_2(BIF_ALIST_2)
     int base;
 
     i = erts_list_length(BIF_ARG_1);
-    if (i < 0)
-      BIF_ERROR(BIF_P, BADARG);
-    
+    if (i < 0 || is_not_small(BIF_ARG_2)) {
+        BIF_ERROR(BIF_P, BADARG);
+    }
+
     base = signed_val(BIF_ARG_2);
 
-    if (base < 2 || base > 36) 
-      BIF_ERROR(BIF_P, BADARG);
+    if (base < 2 || base > 36) {
+        BIF_ERROR(BIF_P, BADARG);
+    }
 
     if (erts_list_to_integer(BIF_P, BIF_ARG_1, base,
                              &res, &dummy) != LTI_ALL_INTEGER) {
diff --git a/erts/emulator/test/num_bif_SUITE.erl b/erts/emulator/test/num_bif_SUITE.erl
index 6b834705cf..fded36431e 100644
--- a/erts/emulator/test/num_bif_SUITE.erl
+++ b/erts/emulator/test/num_bif_SUITE.erl
@@ -544,7 +544,7 @@ t_string_to_integer(Config) when is_list(Config) ->
     test_sti(268435455),
     test_sti(-268435455),
 
-    % Interesting values around 2-pows, such as MIN_SMALL and MAX_SMALL.
+    %% Interesting values around 2-pows, such as MIN_SMALL and MAX_SMALL.
     lists:foreach(fun(Bits) ->
 			  N = 1 bsl Bits,
 			  test_sti(N - 1),
@@ -553,11 +553,11 @@ t_string_to_integer(Config) when is_list(Config) ->
 		  end,
 		  lists:seq(16, 130)),
 
-    %% Bignums.
+    %% Bignums
     test_sti(123456932798748738738,16),
     test_sti(list_to_integer(lists:duplicate(2000, $1))),
 
-    %% unalign string
+    %% Unaligned string
     Str = <<"10">>,
     UnalignStr = <<0:3, (id(Str))/binary, 0:5>>,
     <<_:3, SomeStr:2/binary, _:5>> = id(UnalignStr),
@@ -568,32 +568,39 @@ t_string_to_integer(Config) when is_list(Config) ->
 			  {'EXIT', {badarg, _}} =
 			      (catch binary_to_integer(Value)),
 			  {'EXIT', {badarg, _}} =
-			      (catch erlang:list_to_integer(Value))
+			      (catch list_to_integer(Value))
 		  end,[atom,1.2,0.0,[$1,[$2]]]),
 
-    % Default base error cases
+    %% Default base error cases
     lists:foreach(fun(Value) ->
 			  {'EXIT', {badarg, _}} =
-			      (catch erlang:binary_to_integer(
-				       list_to_binary(Value))),
+			      (catch binary_to_integer(list_to_binary(Value))),
 			  {'EXIT', {badarg, _}} =
-			      (catch erlang:list_to_integer(Value))
+			      (catch list_to_integer(Value))
 		  end,["1.0"," 1"," -1","","+"]),
 
-    % Custom base error cases
+    %% Custom base error cases
     lists:foreach(fun({Value,Base}) ->
 			  {'EXIT', {badarg, _}} =
-			      (catch binary_to_integer(
-				       list_to_binary(Value),Base)),
+			      (catch binary_to_integer(list_to_binary(Value), Base)),
 			  {'EXIT', {badarg, _}} =
-			      (catch erlang:list_to_integer(Value,Base))
-		  end,[{" 1",1},{" 1",37},{"2",2},{"B",11},{"b",11},{":", 16},
-		       {"1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111z",16},
-		       {"1z111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111",16},
-		       {"111z11111111",16}]),
-
-    %% log2 calculation overflow bug in do_integer_to_list (OTP-12624)
-    %% Would crash with segv
+			      (catch list_to_integer(Value, Base))
+		  end,
+                  [{" 1",1},{" 1",37},{"2",2},{"B",11},{"b",11},{":", 16},
+                   {"1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111z",16},
+                   {"1z111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111",16},
+                   {"111z11111111",16},
+                   %% Untagging atoms at the beginning of atom.names
+                   %% would produce a base in the valid range.
+                   {"10",true},                 %Base 4
+                   {"10",'_'},                  %Base 8
+                   {"10",nonode@nohost},        %Base 12
+                   {"10",'$end_of_table'},      %Base 16
+                   {"10",''}                    %Base 20
+                  ]),
+
+    %% log2 calculation overflow bug in do_integer_to_list (OTP-12624).
+    %% Would crash with segementation fault.
     0 = list_to_integer(lists:duplicate(10000000,$0)),
 
     ok.
-- 
2.26.2

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File 2104-Correct-error-handling-for-list_to_integer-2.patch of Package erlang (Revision 15b24e456ec31eded623c8b8a9e37cc4)

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