diff options
Diffstat (limited to 'scope.c')
| -rw-r--r-- | scope.c | 11 |
1 files changed, 8 insertions, 3 deletions
@@ -80,17 +80,22 @@ Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems) si->si_cxmax = cxitems - 1; si->si_cxix = -1; si->si_type = PERLSI_UNDEF; - /* Needs to be Newz() because PUSHSUBST() in pp_subst() - * might otherwise read uninitialized heap. */ - Newz(56, si->si_cxstack, cxitems, PERL_CONTEXT); + New(56, si->si_cxstack, cxitems, PERL_CONTEXT); + /* Without any kind of initialising PUSHSUBST() + * in pp_subst() will read uninitialised heap. */ + Poison(si->si_cxstack, cxitems, PERL_CONTEXT); return si; } I32 Perl_cxinc(pTHX) { + IV old_max = cxstack_max; cxstack_max = GROW(cxstack_max); Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */ + /* Without any kind of initialising deep enough recursion + * will end up reading uninitialised PERL_CONTEXTs. */ + Poison(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT); return cxstack_ix + 1; } |