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From 55b6481ff87f84626ba01275708297a42a6537b1 Mon Sep 17 00:00:00 2001
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From: David Mitchell <davem@iabyn.com>
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Date: Tue, 21 Jun 2016 15:23:20 +0100
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Subject: [PATCH] uninit warning from $h{\const} coredumped
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The code that printed the the name and subscript of a hash element
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in an "uninitialized variable" warning assumed that a constant
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hash subscript would be SvPOK. Something like \1 is a constant,
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but is ROK, not POK. SEGVs ensured.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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sv.c | 5 ++++-
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t/op/hashwarn.t | 19 ++++++++++++++++++-
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2 files changed, 22 insertions(+), 2 deletions(-)
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diff --git a/sv.c b/sv.c
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index 535ee8d..b0fdd15 100644
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--- a/sv.c
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+++ b/sv.c
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@@ -15683,9 +15683,12 @@ Perl_varname(pTHX_ const GV *const gv, const char gvtype, PADOFFSET targ,
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if (subscript_type == FUV_SUBSCRIPT_HASH) {
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SV * const sv = newSV(0);
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+ STRLEN len;
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+ const char * const pv = SvPV_nomg_const((SV*)keyname, len);
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+
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*SvPVX(name) = '$';
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Perl_sv_catpvf(aTHX_ name, "{%s}",
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- pv_pretty(sv, SvPVX_const(keyname), SvCUR(keyname), 32, NULL, NULL,
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+ pv_pretty(sv, pv, len, 32, NULL, NULL,
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PERL_PV_PRETTY_DUMP | PERL_PV_ESCAPE_UNI_DETECT ));
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SvREFCNT_dec_NN(sv);
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}
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diff --git a/t/op/hashwarn.t b/t/op/hashwarn.t
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index a6a1de9..6d72244 100644
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--- a/t/op/hashwarn.t
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+++ b/t/op/hashwarn.t
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@@ -6,7 +6,7 @@ BEGIN {
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}
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require './test.pl';
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-plan( tests => 16 );
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+plan( tests => 18 );
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use strict;
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use warnings;
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@@ -71,3 +71,20 @@ my $fail_not_hr = 'Not a HASH reference at ';
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cmp_ok(scalar(@warnings),'==',0,'pseudo-hash 2 count');
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cmp_ok(substr($@,0,length($fail_not_hr)),'eq',$fail_not_hr,'pseudo-hash 2 msg');
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}
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+
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+# RT #128189
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+# this used to coredump
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+
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+{
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+ @warnings = ();
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+ my %h;
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+
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+ no warnings;
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+ use warnings qw(uninitialized);
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+
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+ my $x = "$h{\1}";
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+ is(scalar @warnings, 1, "RT #128189 - 1 warning");
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+ like("@warnings",
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+ qr/Use of uninitialized value \$h\{"SCALAR\(0x[\da-f]+\)"\}/,
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+ "RT #128189 correct warning");
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+}
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--
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2.5.5
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