diff options
Diffstat (limited to 'scope.c')
| -rw-r--r-- | scope.c | 9 |
1 files changed, 7 insertions, 2 deletions
@@ -80,8 +80,8 @@ 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. */ + /* Needs to be Newz() instead of New() because PUSHSUBST() + * in pp_subst() might otherwise read uninitialized heap. */ Newz(56, si->si_cxstack, cxitems, PERL_CONTEXT); return si; } @@ -89,8 +89,13 @@ Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems) 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 */ + /* Needs to Zero()ed because otherwise deep enough recursion + * (such as in lib/Math/BigInt/t/upgrade.t) will end up reading + * uninitialized heap. */ + Zero(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT); return cxstack_ix + 1; } |