This patch comes from upstream:

We presume it will be part of a future release of procmail.

--- procmail-3.22/src/formisc.c.~2~ 2014-09-04 08:56:27.832599147 -0700

+++ procmail-3.22/src/formisc.c 2014-09-04 08:56:54.543558430 -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;

}