[perl #30733] memory leak in array delete

av_delete() wasn't mortalizing the returned value

p4raw-id: //depot/perl@23158

2 files changed, 16 insertions, 1 deletions

diff --git a/av.c b/av.c
index 3eaeea8ecd..bedd04b41e 100644
--- a/av.c
+++ b/av.c
@@ -864,6 +864,8 @@ Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags)
 	SvREFCNT_dec(sv);
 	sv = Nullsv;
     }
+    else
+	sv = sv_2mortal(sv);
     return sv;
 }
 
diff --git a/t/op/delete.t b/t/op/delete.t
index 53212a1140..ac4405c419 100755
--- a/t/op/delete.t
+++ b/t/op/delete.t
@@ -1,6 +1,6 @@
 #!./perl
 
-print "1..37\n";
+print "1..38\n";
 
 # delete() on hash elements
 
@@ -129,3 +129,16 @@ print @{$refary[0]} == 1 ? "ok 35\n" : "not ok 35 @list\n";
     print "not " if defined $y;
     print "ok 37\n";
 }
+
+{
+    # [perl #30733] array delete didn't free returned element
+    my $x = 0;
+    sub X::DESTROY { $x++ }
+    {
+	my @a;
+	$a[0] = bless [], 'X';
+	my $y = delete $a[0];
+    }
+    print "not " unless $x == 1;
+    print "ok 38\n";
+}