Allocate MADPROPs using PerlMemShared_malloc()

As the MADPROPs are referenced from the optree, which is itself shared,
MADPROPs can't use the default malloc(), which is per i-thread, lest a
child thread frees the optree, and bad things(tm) happen. (a "free to wrong
pool" panic if you're on Win32, or elsewhere if you've got DEBUGGING)

1 files changed, 2 insertions, 3 deletions

diff --git a/op.c b/op.c
index e21b9a478f..5740aa6139 100644
--- a/op.c
+++ b/op.c
@@ -3139,8 +3139,7 @@ Perl_newMADsv(pTHX_ char key, SV* sv)
 MADPROP *
 Perl_newMADPROP(pTHX_ char key, char type, void* val, I32 vlen)
 {
-    MADPROP *mp;
-    Newxz(mp, 1, MADPROP);
+    MADPROP *const mp = (MADPROP *) PerlMemShared_malloc(sizeof(MADPROP));
     mp->mad_next = 0;
     mp->mad_key = key;
     mp->mad_vlen = vlen;
@@ -3177,7 +3176,7 @@ Perl_mad_free(pTHX_ MADPROP* mp)
 	PerlIO_printf(PerlIO_stderr(), "Unrecognized mad\n");
 	break;
     }
-    Safefree(mp);
+    PerlMemShared_free(mp);
 }
 
 #endif