Fix numeric overflows.

* src/pshint/pshalgo.c (psh_hint_align, psh_hint_align_light,
psh_hint_table_find_strong_points): Fix numeric overflows.

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10083

ChangeLog

@@ -1,3 +1,14 @@
+2018-08-29  Armin Hasitzka  <prince.cherusker@gmail.com>
+
+	Fix numeric overflows.
+
+	* src/pshint/pshalgo.c (psh_hint_align, psh_hint_align_light,
+	psh_hint_table_find_strong_points): Fix numeric overflows.
+
+	Reported as
+
+	  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10083
+
 2018-08-29  Werner Lemberg  <wl@gnu.org>
 
 	[cff] Fix handling of `roll' op in old engine.

src/pshinter/pshalgo.c

@@ -479,7 +479,7 @@
 
       if ( dimension == 1 )
         psh_blues_snap_stem( &globals->blues,
-                             hint->org_pos + hint->org_len,
+                             ADD_INT( hint->org_pos, hint->org_len ),
                              hint->org_pos,
                              &align );
 
@@ -703,7 +703,7 @@
 
       if ( dimension == 1 )
         psh_blues_snap_stem( &globals->blues,
-                             hint->org_pos + hint->org_len,
+                             ADD_INT( hint->org_pos, hint->org_len ),
                              hint->org_pos,
                              &align );
 
@@ -1538,8 +1538,8 @@
             PSH_Hint  hint = sort[nn];
 
 
-            if ( org_u >= hint->org_pos                 &&
-                org_u <= hint->org_pos + hint->org_len )
+            if ( org_u >=          hint->org_pos                  &&
+                 org_u <= ADD_INT( hint->org_pos, hint->org_len ) )
             {
               point->hint = hint;
               break;