[PATCH] Update in-kernel zlib routines

These bugs have been fixed in the standard zlib for a while.

See for example

a) http://sources.redhat.com/ml/bug-gnu-utils/1999-06/msg00183.html
b) http://bugs.gentoo.org/show_bug.cgi?id=94584

Signed-off-by: Tim Yamin <[e-mail]>
Signed-off-by: Tavis Ormandy <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/ppc64/boot/zlib.c

···
   {
     *t = (inflate_huft *)Z_NULL;
     *m = 0;
-    return Z_OK;
+    return Z_DATA_ERROR;
   }
 
 
···
     if ((j = *p++) != 0)
       v[x[j]++] = i;
   } while (++i < n);
+  n = x[g];			/* set n to length of v */
 
 
   /* Generate the Huffman codes and for each, make the table entries */

lib/inflate.c

···
   {
     *t = (struct huft *)NULL;
     *m = 0;
-    return 0;
+    return 2;
   }
 
 DEBG("huft2 ");
···
     if ((j = *p++) != 0)
       v[x[j]++] = i;
   } while (++i < n);
+  n = x[g];                   /* set n to length of v */
 
 DEBG("h6 ");
 
···
 DEBG1("2 ");
           f -= a + 1;           /* deduct codes from patterns left */
           xp = c + k;
-          while (++j < z)       /* try smaller tables up to z bits */
-          {
-            if ((f <<= 1) <= *++xp)
-              break;            /* enough codes to use up j bits */
-            f -= *xp;           /* else deduct codes from patterns */
-          }
+          if (j < z)
+            while (++j < z)       /* try smaller tables up to z bits */
+            {
+              if ((f <<= 1) <= *++xp)
+                break;            /* enough codes to use up j bits */
+              f -= *xp;           /* else deduct codes from patterns */
+            }
         }
 DEBG1("3 ");
         z = 1 << j;             /* table entries for j-bit table */

lib/zlib_inflate/inftrees.c

···
   {
     *t = NULL;
     *m = 0;
-    return Z_OK;
+    return Z_DATA_ERROR;
   }