Fixed bug #68740 (NULL Pointer Dereference)

(cherry picked from commit 124fb22)

Author: laruence

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
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 ?? ??? 2015 PHP 5.4.40
 
+- Ereg:
+  . Fixed bug #68740 (NULL Pointer Dereference). (Laruence)
+
 - GD:
   . Fixed bug #68601 (buffer read overflow in gd_gif_in.c). (Remi)
 

ext/ereg/regex/regcomp.c

@@ -1284,6 +1284,10 @@ int c;
 	register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
 	register unsigned uc = (unsigned char)c;
 
+	if (!g->setbits) {
+		return(0);
+	}
+
 	for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
 		if (col[uc] != 0)
 			return(1);