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Fix a memory leak when compiling a regular expression with a POSIX class

This commit is contained in:
Petr Písař 2016-06-14 12:43:55 +02:00
parent 0ef001711b
commit 7f1876649d
2 changed files with 161 additions and 1 deletions
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150
perl-5.24.0-Fix-a-memory-leak-in-strict-regex-posix-classes.patch Normal file
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@ -0,0 +1,150 @@
From 4039933788b0393590f48aef41e9de5462fcc1e9 Mon Sep 17 00:00:00 2001
From: Yves Orton <demerphq@gmail.com>
Date: Wed, 8 Jun 2016 18:42:30 +0200
Subject: [PATCH] Fix a memory leak in strict regex posix classes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This is a perl-5.24.0 port of these four upstream patches fixing RT#128313:
commit ee072c898947f5fee316f1381b29ad692addcf05
Author: Yves Orton <demerphq@gmail.com>
Date: Wed Jun 8 18:42:30 2016 +0200
[perl #128313] Fix leak in perl 5.24 with strict and regex posix char classes
This patch is a refinement of one written by Dan Collins.
Any thanks for this patch should go to him.
commit 7eec73eb790f7c4982edfc28c17c011e8a072490
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Jun 10 12:20:20 2016 +0200
move warning text to RExC_state (via RExC_warn_text)
This way we reuse the same AV each time, and avoid various refcount bookkeeping issues, all at a relatively modest cost (IMO)
commit 0bf54b1ecaec8f6d80845d6cb77d62f8c9f4c415
Author: Yves Orton <demerphq@gmail.com>
Date: Fri Jun 10 13:34:37 2016 +0200
fixup, guard av_top_index() for null RExC_warn_text
commit 222c4b0094b4145d06cb164bedd2a66a3141203b
Author: Dan Collins <dcollinsn@gmail.com>
Date: Wed Jun 8 16:26:07 2016 -0400
[perl #128313] test for memory leak in POSIX classes
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
regcomp.c | 21 ++++++++++-----------
t/op/svleak.t | 12 +++++++++++-
2 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/regcomp.c b/regcomp.c
index be6cb96..f29892c 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -199,6 +199,7 @@ struct RExC_state_t {
scan_frame *frame_head;
scan_frame *frame_last;
U32 frame_count;
+ AV *warn_text;
#ifdef ADD_TO_REGEXEC
char *starttry; /* -Dr: where regtry was called. */
#define RExC_starttry (pRExC_state->starttry)
@@ -288,6 +289,7 @@ struct RExC_state_t {
#define RExC_frame_last (pRExC_state->frame_last)
#define RExC_frame_count (pRExC_state->frame_count)
#define RExC_strict (pRExC_state->strict)
+#define RExC_warn_text (pRExC_state->warn_text)
/* Heuristic check on the complexity of the pattern: if TOO_NAUGHTY, we set
* a flag to disable back-off on the fixed/floating substrings - if it's
@@ -6767,6 +6769,7 @@ Perl_re_op_compile(pTHX_ SV ** const patternp, int pat_count,
#endif
}
+ pRExC_state->warn_text = NULL;
pRExC_state->code_blocks = NULL;
pRExC_state->num_code_blocks = 0;
@@ -13704,8 +13707,8 @@ S_populate_ANYOF_from_invlist(pTHX_ regnode *node, SV** invlist_ptr)
* routine. q.v. */
#define ADD_POSIX_WARNING(p, text) STMT_START { \
if (posix_warnings) { \
- if (! warn_text) warn_text = newAV(); \
- av_push(warn_text, Perl_newSVpvf(aTHX_ \
+ if (! RExC_warn_text ) RExC_warn_text = (AV *) sv_2mortal((SV *) newAV()); \
+ av_push(RExC_warn_text, Perl_newSVpvf(aTHX_ \
WARNING_PREFIX \
text \
REPORT_LOCATION, \
@@ -13836,7 +13839,6 @@ S_handle_possible_posix(pTHX_ RExC_state_t *pRExC_state,
bool has_opening_colon = FALSE;
int class_number = OOB_NAMEDCLASS; /* Out-of-bounds until find
valid class */
- AV* warn_text = NULL; /* any warning messages */
const char * possible_end = NULL; /* used for a 2nd parse pass */
const char* name_start; /* ptr to class name first char */
@@ -13852,6 +13854,9 @@ S_handle_possible_posix(pTHX_ RExC_state_t *pRExC_state,
PERL_ARGS_ASSERT_HANDLE_POSSIBLE_POSIX;
+ if (posix_warnings && RExC_warn_text)
+ av_clear(RExC_warn_text);
+
if (p >= e) {
return NOT_MEANT_TO_BE_A_POSIX_CLASS;
}
@@ -14469,14 +14474,8 @@ S_handle_possible_posix(pTHX_ RExC_state_t *pRExC_state,
ADD_POSIX_WARNING(p, "there is no terminating ']'");
}
- if (warn_text) {
- if (posix_warnings) {
- /* mortalize to avoid a leak with FATAL warnings */
- *posix_warnings = (AV *) sv_2mortal((SV *) warn_text);
- }
- else {
- SvREFCNT_dec_NN(warn_text);
- }
+ if (posix_warnings && RExC_warn_text && av_top_index(RExC_warn_text) > -1) {
+ *posix_warnings = RExC_warn_text;
}
}
else if (class_number != OOB_NAMEDCLASS) {
diff --git a/t/op/svleak.t b/t/op/svleak.t
index 595bf3e..c18f498 100644
--- a/t/op/svleak.t
+++ b/t/op/svleak.t
@@ -15,7 +15,7 @@ BEGIN {
use Config;
-plan tests => 131;
+plan tests => 132;
# run some code N times. If the number of SVs at the end of loop N is
# greater than (N-1)*delta at the end of loop 1, we've got a leak
@@ -537,3 +537,13 @@ EOF
::leak(5, 0, \&f, q{goto shouldn't leak @_});
}
+
+# [perl #128313] POSIX warnings shouldn't leak
+{
+ no warnings 'experimental';
+ use re 'strict';
+ my $a = 'aaa';
+ my $b = 'aa';
+ sub f { $a =~ /[^.]+$b/; }
+ ::leak(2, 0, \&f, q{use re 'strict' shouldn't leak warning strings});
+}
--
2.5.5

12
perl.spec
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@ -28,7 +28,7 @@
Name: perl
Version: %{perl_version}
# release number must be even higher, because dual-lived modules will be broken otherwise
Release: 364%{?dist}
Release: 365%{?dist}
Epoch: %{perl_epoch}
Summary: Practical Extraction and Report Language
Group: Development/Languages
@ -113,6 +113,10 @@ Patch28: perl-5.22.0-Revert-const-the-core-magic-vtables.patch
# This allows not to require perl-devel. Bug #1129443
Patch30: perl-5.22.1-Replace-EU-MM-dependnecy-with-EU-MM-Utils-in-IPC-Cmd.patch
# Fix a memory leak when compiling a regular expression with a POSIX class,
# RT#128313, in upstream after 5.25.1
Patch31: perl-5.24.0-Fix-a-memory-leak-in-strict-regex-posix-classes.patch
# Link XS modules to libperl.so with EU::CBuilder on Linux, bug #960048
Patch200: perl-5.16.3-Link-XS-modules-to-libperl.so-with-EU-CBuilder-on-Li.patch
@ -2762,6 +2766,7 @@ Perl extension for Version Objects
%patch26 -p1
%patch28 -p1
%patch30 -p1
%patch31 -p1
%patch200 -p1
%patch201 -p1
@ -2783,6 +2788,7 @@ perl -x patchlevel.h \
'Fedora Patch27: Make PadlistNAMES() lvalue again (CPAN RT#101063)' \
'Fedora Patch28: Make magic vtable writable as a work-around for Coro (CPAN RT#101063)' \
'Fedora Patch30: Replace EU::MakeMaker dependency with EU::MM::Utils in IPC::Cmd (bug #1129443)' \
'Fedora Patch31: Fix a memory leak in compiling a POSIX class (RT#128313)' \
'Fedora Patch200: Link XS modules to libperl.so with EU::CBuilder on Linux' \
'Fedora Patch201: Link XS modules to libperl.so with EU::MM on Linux' \
%{nil}
@ -5049,6 +5055,10 @@ popd
# Old changelog entries are preserved in CVS.
%changelog
* Tue Jun 14 2016 Petr Pisar <ppisar@redhat.com> - 4:5.24.0-365
- Fix a memory leak when compiling a regular expression with a POSIX class
(RT#128313)
* Thu May 19 2016 Petr Pisar <ppisar@redhat.com> - 4:5.24.0-364
- Remove reflexive dependencies
- Use pregenerated dependencies on bootstrapping