perl/perl-5.33.3-pp_split-add-TonyC-s-stack-not-refcounted-suggestion.patch
Petr Písař 1c329f55ed Fix a crash in optimizing split()
We also added av_count() in-line function. It's a dependency and it
toke a big traction in the upstream. It will ease backporting future
fixes.
2020-11-19 18:10:25 +01:00

55 lines
1.8 KiB
Diff

From ab307de390c3459badcc89b3d77542b5b871b2e8 Mon Sep 17 00:00:00 2001
From: Richard Leach <richardleach@users.noreply.github.com>
Date: Tue, 20 Oct 2020 18:16:38 +0100
Subject: [PATCH 2/2] pp_split: add TonyC's stack-not-refcounted-suggestion and
tests
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
pp.c | 5 ++++-
t/op/split.t | 5 +++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/pp.c b/pp.c
index ce16c56e63..5b5e163011 100644
--- a/pp.c
+++ b/pp.c
@@ -6034,6 +6034,9 @@ PP(pp_split)
oldsave = PL_savestack_ix;
}
+ /* Some defence against stack-not-refcounted bugs */
+ (void)sv_2mortal(SvREFCNT_inc_simple_NN(ary));
+
if ((mg = SvTIED_mg((const SV *)ary, PERL_MAGIC_tied))) {
PUSHMARK(SP);
XPUSHs(SvTIED_obj(MUTABLE_SV(ary), mg));
@@ -6356,7 +6359,7 @@ PP(pp_split)
}
PUTBACK;
- LEAVE_SCOPE(oldsave); /* may undo an earlier SWITCHSTACK */
+ LEAVE_SCOPE(oldsave);
SPAGAIN;
if (realarray) {
if (!mg) {
diff --git a/t/op/split.t b/t/op/split.t
index 1d78a45bde..7a321645ac 100644
--- a/t/op/split.t
+++ b/t/op/split.t
@@ -703,3 +703,8 @@ fresh_perl_is('my @ary; @ary = split(/\w(?{ @ary[1000] = 1 })/, "abc");',
fresh_perl_is('my @ary; @ary = split(/\w(?{ undef @ary })/, "abc");',
'',{},'(@ary = split ...) survives an (undef @ary)');
+# check the (@ary = split) optimisation survives stack-not-refcounted bugs
+fresh_perl_is('our @ary; @ary = split(/\w(?{ *ary = 0 })/, "abc");',
+ '',{},'(@ary = split ...) survives @ary destruction via typeglob');
+fresh_perl_is('my $ary = []; @$ary = split(/\w(?{ $ary = [] })/, "abc");',
+ '',{},'(@ary = split ...) survives @ary destruction via reassignment');
--
2.25.4