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From http://seclists.org/oss-sec/2014/q3/495 (with whitespace corrected).

--- a/src/formisc.c 2013-08-04 00:13:33.000000000 -0700
+++ b/src/formisc.c 2014-09-03 11:42:25.986002396 -0700
@@ -84,12 +84,11 @@
 	case '"':*target++=delim='"';start++;
       }
      ;{ int i;
-	do
+	while(*start)
 	   if((i= *target++= *start++)==delim)	 /* corresponding delimiter? */
 	      break;
 	   else if(i=='\\'&&*start)		    /* skip quoted character */
 	      *target++= *start++;
-	while(*start);						/* anything? */
       }
      hitspc=2;
    }