dovecot-2.2: lib: Fixed read buffer overflow in wildcard_match*()

[dovecot at dovecot.org]

details:   http://hg.dovecot.org/dovecot-2.2/rev/740935acc0f8
changeset: 18891:740935acc0f8
user:      Timo Sirainen <tss at iki.fi>
date:      Mon Jun 29 13:06:03 2015 +0300
description:
lib: Fixed read buffer overflow in wildcard_match*()
Patch by Hanno Böck.

Note that input to wildard_match*() is always coming only from trusted
sources, like config file or doveadm commands.

diffstat:

 src/lib/wildcard-match.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (18 lines):

diff -r 85822087fe3d -r 740935acc0f8 src/lib/wildcard-match.c
--- a/src/lib/wildcard-match.c	Mon Jun 29 12:05:25 2015 +0300
+++ b/src/lib/wildcard-match.c	Mon Jun 29 13:06:03 2015 +0300
@@ -35,10 +35,10 @@
 	  return ma[0] == '\0' ? MATCH : NOMATCH;
   }
   /* find the end of each string */
-  while (*(++mask));
-  mask--;
-  while (*(++data));
-  data--;
+  while (*(mask++));
+  mask-=2;
+  while (*(data++));
+  data-=2;
 
   while (data >= na) {
     /* If the mask runs out of chars before the string, fall back on