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perl/perl-5.34.0-Destroy-GDBM-NDBM-ODBM-SDBM-_File-objects-only-from-.patch
Jitka Plesnikova 8a058d72b1 5.36.0 bump
2022-05-30 13:11:46 +02:00

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From 8067179e65a28d91f00df7d36778229a07514471 Mon Sep 17 00:00:00 2001
From: Jitka Plesnikova <jplesnik@redhat.com>
Date: Thu, 29 Apr 2021 12:21:18 +0200
Subject: [PATCH] Destroy {GDBM,NDBM,ODBM,SDBM}_File objects only from original
This patch fixes a crash when destroing a hash tied to a *_File
database after spawning a thread:
use Fcntl;
use SDBM_File;
use threads;
tie(my %dbtest, 'SDBM_File', "test.db", O_RDWR|O_CREAT, 0666);
threads->new(sub {})->join;
This crashed or paniced depending on how perl was configured.
Closes RT#61912.
Updated original ppisar's patch for perl 5.18.2
---
ext/GDBM_File/GDBM_File.xs | 20 ++++++++++++--------
ext/NDBM_File/NDBM_File.xs | 16 ++++++++++------
ext/ODBM_File/ODBM_File.xs | 18 +++++++++++-------
ext/SDBM_File/SDBM_File.xs | 4 +++-
t/lib/dbmt_common.pl | 35 +++++++++++++++++++++++++++++++++++
5 files changed, 71 insertions(+), 22 deletions(-)
diff --git a/ext/GDBM_File/GDBM_File.xs b/ext/GDBM_File/GDBM_File.xs
index cd0bb6f..0c395ac 100644
--- a/ext/GDBM_File/GDBM_File.xs
+++ b/ext/GDBM_File/GDBM_File.xs
@@ -13,6 +13,7 @@
#define store_value 3
typedef struct {
+ tTHX owner;
GDBM_FILE dbp ;
SV * filter[4];
int filtering ;
@@ -276,6 +277,7 @@ gdbm_TIEHASH(dbtype, name, read_write, mode)
}
if (dbp) {
RETVAL = (GDBM_File)safecalloc(1, sizeof(GDBM_File_type));
+ RETVAL->owner = aTHX;
RETVAL->dbp = dbp;
} else {
RETVAL = NULL;
@@ -289,15 +291,17 @@ gdbm_DESTROY(db)
PREINIT:
int i = store_value;
CODE:
- if (gdbm_file_close(db)) {
- croak("gdbm_close: %s; %s", gdbm_strerror(gdbm_errno),
- strerror(errno));
+ if (db && db->owner == aTHX) {
+ if (gdbm_file_close(db)) {
+ croak("gdbm_close: %s; %s", gdbm_strerror(gdbm_errno),
+ strerror(errno));
+ }
+ do {
+ if (db->filter[i])
+ SvREFCNT_dec(db->filter[i]);
+ } while (i-- > 0);
+ safefree(db);
}
- do {
- if (db->filter[i])
- SvREFCNT_dec(db->filter[i]);
- } while (i-- > 0);
- safefree(db);
void
gdbm_UNTIE(db, count)
diff --git a/ext/NDBM_File/NDBM_File.xs b/ext/NDBM_File/NDBM_File.xs
index eed671a..651fe0f 100644
--- a/ext/NDBM_File/NDBM_File.xs
+++ b/ext/NDBM_File/NDBM_File.xs
@@ -33,6 +33,7 @@ END_EXTERN_C
#define store_value 3
typedef struct {
+ tTHX owner;
DBM * dbp ;
SV * filter[4];
int filtering ;
@@ -71,6 +72,7 @@ ndbm_TIEHASH(dbtype, filename, flags, mode)
RETVAL = NULL ;
if ((dbp = dbm_open(filename, flags, mode))) {
RETVAL = (NDBM_File)safecalloc(1, sizeof(NDBM_File_type));
+ RETVAL->owner = aTHX;
RETVAL->dbp = dbp ;
}
@@ -84,12 +86,14 @@ ndbm_DESTROY(db)
PREINIT:
int i = store_value;
CODE:
- dbm_close(db->dbp);
- do {
- if (db->filter[i])
- SvREFCNT_dec(db->filter[i]);
- } while (i-- > 0);
- safefree(db);
+ if (db && db->owner == aTHX) {
+ dbm_close(db->dbp);
+ do {
+ if (db->filter[i])
+ SvREFCNT_dec(db->filter[i]);
+ } while (i-- > 0);
+ safefree(db);
+ }
#define ndbm_FETCH(db,key) dbm_fetch(db->dbp,key)
datum_value
diff --git a/ext/ODBM_File/ODBM_File.xs b/ext/ODBM_File/ODBM_File.xs
index 38e6dbf..4b15a42 100644
--- a/ext/ODBM_File/ODBM_File.xs
+++ b/ext/ODBM_File/ODBM_File.xs
@@ -49,6 +49,7 @@ datum nextkey(datum key);
#define store_value 3
typedef struct {
+ tTHX owner;
void * dbp ;
SV * filter[4];
int filtering ;
@@ -137,6 +138,7 @@ odbm_TIEHASH(dbtype, filename, flags, mode)
}
dbp = (void*)(dbminit(filename) >= 0 ? &dbmrefcnt : 0);
RETVAL = (ODBM_File)safecalloc(1, sizeof(ODBM_File_type));
+ RETVAL->owner = aTHX;
RETVAL->dbp = dbp ;
}
OUTPUT:
@@ -149,13 +151,15 @@ DESTROY(db)
dMY_CXT;
int i = store_value;
CODE:
- dbmrefcnt--;
- dbmclose();
- do {
- if (db->filter[i])
- SvREFCNT_dec(db->filter[i]);
- } while (i-- > 0);
- safefree(db);
+ if (db && db->owner == aTHX) {
+ dbmrefcnt--;
+ dbmclose();
+ do {
+ if (db->filter[i])
+ SvREFCNT_dec(db->filter[i]);
+ } while (i-- > 0);
+ safefree(db);
+ }
datum_value
odbm_FETCH(db, key)
diff --git a/ext/SDBM_File/SDBM_File.xs b/ext/SDBM_File/SDBM_File.xs
index 0df2855..0e2bd58 100644
--- a/ext/SDBM_File/SDBM_File.xs
+++ b/ext/SDBM_File/SDBM_File.xs
@@ -10,6 +10,7 @@
#define store_value 3
typedef struct {
+ tTHX owner;
DBM * dbp ;
SV * filter[4];
int filtering ;
@@ -51,6 +52,7 @@ sdbm_TIEHASH(dbtype, filename, flags, mode, pagname=NULL)
}
if (dbp) {
RETVAL = (SDBM_File)safecalloc(1, sizeof(SDBM_File_type));
+ RETVAL->owner = aTHX;
RETVAL->dbp = dbp ;
}
@@ -62,7 +64,7 @@ void
sdbm_DESTROY(db)
SDBM_File db
CODE:
- if (db) {
+ if (db && db->owner == aTHX) {
int i = store_value;
sdbm_close(db->dbp);
do {
diff --git a/t/lib/dbmt_common.pl b/t/lib/dbmt_common.pl
index 60c66ae..a7f81fe 100644
--- a/t/lib/dbmt_common.pl
+++ b/t/lib/dbmt_common.pl
@@ -510,5 +510,40 @@ unlink <Op_dbmx*>, $Dfile;
unlink <Op1_dbmx*>;
}
+{
+ # Check DBM back-ends do not destroy objects from then-spawned threads.
+ # RT#61912.
+ SKIP: {
+ my $threads_count = 2;
+ skip 'Threads are disabled', 3 + 2 * $threads_count
+ unless $Config{usethreads};
+ use_ok('threads');
+
+ my %h;
+ unlink <Op1_dbmx*>;
+
+ my $db = tie %h, $DBM_Class, 'Op1_dbmx', $create, 0640;
+ isa_ok($db, $DBM_Class);
+
+ for (1 .. 2) {
+ ok(threads->create(
+ sub {
+ $SIG{'__WARN__'} = sub { fail(shift) }; # debugging perl panics
+ # report it by spurious TAP line
+ 1;
+ }), "Thread $_ created");
+ }
+ for (threads->list) {
+ is($_->join, 1, "A thread exited successfully");
+ }
+
+ pass("Tied object survived exiting threads");
+
+ undef $db;
+ untie %h;
+ unlink <Op1_dbmx*>;
+ }
+}
+
done_testing();
1;
--
2.26.3
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