[perl #114984] Glob.xs: Extend stack when returning

If a pattern passed to File::Glob consists of a space-separated list
of patterns, the stack will only be extended by doglob() enough for
the list returned by each subpattern.  So iterate() needs to extend
the stack before copying the list of files from an AV to the stack.

This fixes a regression introduced in 5.16.0.

2 files changed, 26 insertions, 0 deletions

diff --git a/ext/File-Glob/Glob.xs b/ext/File-Glob/Glob.xs
index 3ea05909c6..d74e7a4965 100644
--- a/ext/File-Glob/Glob.xs
+++ b/ext/File-Glob/Glob.xs
@@ -93,6 +93,7 @@ iterate(pTHX_ bool(*globber)(pTHX_ AV *entries, SV *patsv))
     /* chuck it all out, quick or slow */
     if (gimme == G_ARRAY) {
 	if (!on_stack) {
+	    EXTEND(SP, AvFILLp(entries)+1);
 	    Copy(AvARRAY(entries), SP+1, AvFILLp(entries)+1, SV *);
 	    SP += AvFILLp(entries)+1;
 	}
diff --git a/ext/File-Glob/t/rt114984.t b/ext/File-Glob/t/rt114984.t
new file mode 100644
index 0000000000..4229c6b780
--- /dev/null
+++ b/ext/File-Glob/t/rt114984.t
@@ -0,0 +1,25 @@
+use strict;
+use warnings;
+use v5.16.0;
+use File::Temp 'tempdir';
+use File::Spec::Functions;
+use Test::More tests => 1;
+
+my @md = (1..305);
+my @mp = (1000..1205);
+
+my $path = tempdir uc cleanup => 1;
+
+foreach (@md) {
+    open(my $f, ">", catfile $path, "md_$_.dat");
+    close $f;
+}
+
+foreach (@mp) {
+    open(my $f, ">", catfile $path, "mp_$_.dat");
+    close $f;
+}
+my @b = glob(qq{$path/mp_[0123456789]*.dat
+                $path/md_[0123456789]*.dat});
+is scalar(@b), @md+@mp,
+    'File::Glob extends the stack when returning a long list';