diff --git a/ChangeLog b/ChangeLog
index ab5031f616..05b82c4ae7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,13 @@
-Fri Dec 26 14:51:34 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Dec 26 15:09:08 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* process.c (rb_spawn_process): get rid of usage of uninitialized
+	  variable.
+	  reported by Denis Denisov <denji0k AT gmail.com>.
+
+	* regexec.c (match_at): ditto.
+
+	* ext/win32ole/win32ole.c (ole_wc2mb_alloc, ole_vstr2wc, ole_mb2wc):
+	  ditto.
 
 	* dir.c (ruby_glob0): no need to check never-NULL pointer.
 	  reported by Denis Denisov <denji0k AT gmail.com>.
diff --git a/ext/win32ole/win32ole.c b/ext/win32ole/win32ole.c
index 9daa8554ba..582ff32c78 100644
--- a/ext/win32ole/win32ole.c
+++ b/ext/win32ole/win32ole.c
@@ -579,11 +579,13 @@ load_conv_function51932(void)
 	pIMultiLanguage = p;
     }
 }
+#define need_conv_function51932() (load_conv_function51932(), 1)
 #else
 #define load_conv_function51932() failed_load_conv51932()
+#define need_conv_function51932() (failed_load_conv51932(), 0)
 #endif
 
-#define conv_51932(cp) ((cp) == 51932 && (load_conv_function51932(), 1))
+#define conv_51932(cp) ((cp) == 51932 && need_conv_function51932())
 
 static void
 set_ole_codepage(UINT cp)
@@ -711,8 +713,8 @@ ole_wc2mb_alloc(LPWSTR pw, char *(alloc)(UINT size, void *arg), void *arg)
             ole_raise(hr, eWIN32OLERuntimeError, "fail to convert Unicode to CP%d", cWIN32OLE_cp);
 	}
 	pm[size] = '\0';
+	return pm;
 #endif
-        return pm;
     }
     size = WideCharToMultiByte(cWIN32OLE_cp, 0, pw, -1, NULL, 0, NULL, NULL);
     if (size) {
@@ -893,8 +895,8 @@ ole_vstr2wc(VALUE vstr)
 	if (FAILED(hr)) {
             ole_raise(hr, eWIN32OLERuntimeError, "fail to convert CP%d to Unicode", cp);
 	}
-#endif
 	return pw;
+#endif
     }
     size = MultiByteToWideChar(cp, 0, RSTRING_PTR(vstr), RSTRING_LEN(vstr), NULL, 0);
     pw = SysAllocStringLen(NULL, size);
@@ -923,8 +925,8 @@ ole_mb2wc(char *pm, int len)
 	if (FAILED(hr)) {
             ole_raise(hr, eWIN32OLERuntimeError, "fail to convert CP%d to Unicode", cWIN32OLE_cp);
 	}
-#endif
 	return pw;
+#endif
     }
     size = MultiByteToWideChar(cWIN32OLE_cp, 0, pm, len, NULL, 0);
     pw = SysAllocStringLen(NULL, size - 1);
diff --git a/process.c b/process.c
index 25cdc1605b..2a5ed993bf 100644
--- a/process.c
+++ b/process.c
@@ -3910,6 +3910,7 @@ rb_spawn_process(struct rb_execarg *eargp, char *errmsg, size_t errmsg_buflen)
     }
     status = system(StringValuePtr(prog));
     rb_last_status_set((status & 0xff) << 8, 0);
+    pid = 1;			/* dummy */
 # endif
 
     rb_execarg_run_options(&sarg, NULL, errmsg, errmsg_buflen);
diff --git a/regexec.c b/regexec.c
index 1ec337fdc1..299c3161a5 100644
--- a/regexec.c
+++ b/regexec.c
@@ -1408,8 +1408,9 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
       int len;
       fprintf(stderr, "%4"PRIdPTR"> \"", (*p == OP_FINISH) ? (ptrdiff_t )-1 : s - str);
       bp = buf;
+      q = s;
       if (*p != OP_FINISH) {    /* s may not be a valid pointer if OP_FINISH. */
-	for (i = 0, q = s; i < 7 && q < end; i++) {
+	for (i = 0; i < 7 && q < end; i++) {
 	  len = enclen(encode, q, end);
 	  while (len-- > 0) *bp++ = *q++;
 	}