[perl #124099] Wrong CvOUTSIDE in find_lexical_cv

Instead of following the chain of CvOUTSIDE pointers, I had it always
looking at the CvOUTSIDE pointer of the current PL_compcv.  So any
time it had to dig down more than one level, it had a chance of crash-
ing or looping.

2 files changed, 7 insertions, 1 deletions

diff --git a/op.c b/op.c
index 89bf436969..3000c4481c 100644
--- a/op.c
+++ b/op.c
@@ -11238,7 +11238,7 @@ Perl_find_lexical_cv(pTHX_ PADOFFSET off)
     CV *compcv = PL_compcv;
     while (PadnameOUTER(name)) {
 	assert(PARENT_PAD_INDEX(name));
-	compcv = CvOUTSIDE(PL_compcv);
+	compcv = CvOUTSIDE(compcv);
 	name = PadlistNAMESARRAY(CvPADLIST(compcv))
 		[off = PARENT_PAD_INDEX(name)];
     }
diff --git a/t/op/lexsub.t b/t/op/lexsub.t
index b1b76e84c3..adccf4c5db 100644
--- a/t/op/lexsub.t
+++ b/t/op/lexsub.t
@@ -961,3 +961,9 @@ like runperl(
   @AutoloadTest::ISA = AutoloadTestSuper::;
   AutoloadTest->blah;
 }
+
+# This used to crash because op.c:find_lexical_cv was looking at the wrong
+# CV’s OUTSIDE pointer.  [perl #124099]
+{
+  my sub h; sub{my $x; sub{h}}
+}