C<foreach my $x ...> in pseudo-fork()ed process may diddle

parent's memory; fix it by keeping track of the actual pad
offset rather than a raw pointer (this change is probably also
relevant to non-ithreads case to avoid fallout from reallocs of
the pad array, but is currently only enabled for the ithreads
case in the interests of minimal disruption to existing "well
tested" code)

p4raw-id: //depot/perl@7858

1 files changed, 3 insertions, 1 deletions

diff --git a/pp_ctl.c b/pp_ctl.c
index 2b217dd059..d22f2efc0f 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -1776,9 +1776,11 @@ PP(pp_enteriter)
     else
 #endif /* USE_THREADS */
     if (PL_op->op_targ) {
+#ifndef USE_ITHREADS
 	svp = &PL_curpad[PL_op->op_targ];		/* "my" variable */
 	SAVESPTR(*svp);
-#ifdef USE_ITHREADS
+#else
+	SAVEPADSV(PL_op->op_targ);
 	iterdata = (void*)PL_op->op_targ;
 	cxtype |= CXp_PADVAR;
 #endif