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authorSverker Eriksson <[email protected]>2018-10-09 12:28:12 +0200
committerSverker Eriksson <[email protected]>2018-10-09 12:28:12 +0200
commitaa086af7156490e22d139ab2938544ad07714169 (patch)
tree539755b94e3a2a64b55a017b416fbeb4a9854804 /lib/stdlib
parent040bdce67f88d833bfb59adae130a4ffb4c180f0 (diff)
downloadotp-aa086af7156490e22d139ab2938544ad07714169.tar.gz
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erts: Fix bug in ets:select_replace for bound key
which may cause following calls to ets:next or ets:prev to fail.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/test/ets_SUITE.erl22
1 files changed, 21 insertions, 1 deletions
diff --git a/lib/stdlib/test/ets_SUITE.erl b/lib/stdlib/test/ets_SUITE.erl
index 05451a83fb..257a718404 100644
--- a/lib/stdlib/test/ets_SUITE.erl
+++ b/lib/stdlib/test/ets_SUITE.erl
@@ -41,7 +41,7 @@
-export([t_delete_object/1, t_init_table/1, t_whitebox/1,
select_bound_chunk/1,
t_delete_all_objects/1, t_insert_list/1, t_test_ms/1,
- t_select_delete/1,t_select_replace/1,t_ets_dets/1]).
+ t_select_delete/1,t_select_replace/1,t_select_replace_next_bug/1,t_ets_dets/1]).
-export([ordered/1, ordered_match/1, interface_equality/1,
fixtable_next/1, fixtable_insert/1, rename/1, rename_unnamed/1, evil_rename/1,
@@ -122,6 +122,7 @@ all() ->
select_bound_chunk,
t_init_table, t_whitebox, t_delete_all_objects,
t_insert_list, t_test_ms, t_select_delete, t_select_replace,
+ t_select_replace_next_bug,
t_ets_dets, memory, t_select_reverse, t_bucket_disappears,
select_fail, t_insert_new, t_repair_continuation,
otp_5340, otp_6338, otp_6842_select_1000, otp_7665,
@@ -1373,6 +1374,25 @@ t_select_replace(Config) when is_list(Config) ->
verify_etsmem(EtsMem).
+%% OTP-15346: Bug caused select_replace of bound key to corrupt static stack
+%% used by ets:next and ets:prev.
+t_select_replace_next_bug(Config) when is_list(Config) ->
+ T = ets:new(k, [ordered_set]),
+ [ets:insert(T, {I, value}) || I <- lists:seq(1,10)],
+ 1 = ets:first(T),
+
+ %% Make sure select_replace does not leave pointer
+ %% to deallocated {2,value} in static stack.
+ MS = [{{2,value}, [], [{{2,"new_value"}}]}],
+ 1 = ets:select_replace(T, MS),
+
+ %% This would crash or give wrong result at least on DEBUG emulator
+ %% where deallocated memory is overwritten.
+ 2 = ets:next(T, 1),
+
+ ets:delete(T).
+
+
%% Test that partly bound keys gives faster matches.
partly_bound(Config) when is_list(Config) ->
case os:type() of