Fix some unlikely possible uninitialized reads

[perl/modules/Scope-Upper.git] / Upper.xs

diff --git a/Upper.xs b/Upper.xs
index c7b3a6e299c34638079caa028be99cf3447887fe..17c4407eca2b39af44177bd1433e86133eee031c 100644 (file)
--- a/Upper.xs
+++ b/Upper.xs
@@ -247,7 +247,7 @@ STATIC void su_save_helem(pTHX_ HV *hv, SV *keysv, SV *val) {
  if (val) { /* local $x{$keysv} = $val; */
   SvSetMagicSV(*svp, val);
  } else {   /* local $x{$keysv}; delete $x{$keysv}; */
-  hv_delete_ent(hv, keysv, G_DISCARD, HeHASH(he));
+  (void)hv_delete_ent(hv, keysv, G_DISCARD, HeHASH(he));
  }
 }
 
@@ -295,11 +295,12 @@ STATIC void su_call(pTHX_ void *ud_) {
   * when the new sub scope will be created in call_sv. */
 
 #if SU_HAS_PERL(5, 10, 0)
- if (dieing)
+ if (dieing) {
   if (cxstack_ix < cxstack_max)
    ++cxstack_ix;
   else
    cxstack_ix = Perl_cxinc(aTHX);
+ }
 #endif
 
  call_sv(ud->cb, G_VOID);
@@ -578,6 +579,8 @@ STATIC void su_unwind(pTHX_ void *ud_) {
  SV **savesp = MY_CXT.savesp;
  I32 mark;
 
+ PERL_UNUSED_VAR(ud_);
+
  if (savesp)
   PL_stack_sp = savesp;
 
@@ -638,13 +641,15 @@ STATIC void su_unwind(pTHX_ void *ud_) {
  STMT_START {                  \
   if (items > A) {             \
    SV *csv = ST(B);            \
-   if (SvOK(csv))              \
-    cxix = SvIV(csv);          \
+   if (!SvOK(csv))             \
+    goto default_cx;           \
+   cxix = SvIV(csv);           \
    if (cxix < 0)               \
     cxix = 0;                  \
    else if (cxix > cxstack_ix) \
     cxix = cxstack_ix;         \
   } else {                     \
+default_cx:                    \
    cxix = cxstack_ix;          \
    if (PL_DBsub)               \
     SU_SKIP_DB(cxix);          \
@@ -653,14 +658,15 @@ STATIC void su_unwind(pTHX_ void *ud_) {
 
 #define SU_GET_LEVEL(A, B) \
  STMT_START {              \
+  level = 0;               \
   if (items > 0) {         \
    SV *lsv = ST(B);        \
-   if (SvOK(lsv))          \
+   if (SvOK(lsv)) {        \
     level = SvIV(lsv);     \
-   if (level < 0)          \
-    level = 0;             \
-  } else                   \
-   level = 0;              \
+    if (level < 0)         \
+     level = 0;            \
+   }                       \
+  }                        \
  } STMT_END
 
 XS(XS_Scope__Upper_unwind); /* prototype to pass -Wmissing-prototypes */
@@ -719,12 +725,15 @@ BOOT:
  newXSproto("Scope::Upper::unwind", XS_Scope__Upper_unwind, file, NULL);
 }
 
+#if SU_THREADSAFE
+
 void
 CLONE(...)
 PROTOTYPE: DISABLE
 CODE:
-#if SU_THREADSAFE
+ PERL_UNUSED_VAR(items);
  MY_CXT_CLONE;
+
 #endif /* SU_THREADSAFE */
 
 SV *