diff --git a/jdk/src/java.desktop/share/classes/sun/font/CompositeFont.java b/jdk/src/java.desktop/share/classes/sun/font/CompositeFont.java
index f2defd79771..7b19bb362cb 100644
--- a/jdk/src/java.desktop/share/classes/sun/font/CompositeFont.java
+++ b/jdk/src/java.desktop/share/classes/sun/font/CompositeFont.java
@@ -71,6 +71,13 @@ public final class CompositeFont extends Font2D {
         } else {
             numSlots = componentNames.length;
         }
+        /* We will limit the number of slots to 254.
+         * We store the slot for a glyph id in a byte and we may use one slot
+         * for an EUDC font, and we may also create a composite
+         * using this composite as a backup for a physical font.
+         * So we want to leave space for the two additional slots.
+         */
+         numSlots = (numSlots <= 254) ? numSlots : 254;
 
         /* Only the first "numMetricsSlots" slots are used for font metrics.
          * the rest are considered "fallback" slots".
diff --git a/jdk/src/java.desktop/share/classes/sun/font/FileFontStrike.java b/jdk/src/java.desktop/share/classes/sun/font/FileFontStrike.java
index 7fb9f65c7ab..f5c478fb517 100644
--- a/jdk/src/java.desktop/share/classes/sun/font/FileFontStrike.java
+++ b/jdk/src/java.desktop/share/classes/sun/font/FileFontStrike.java
@@ -420,14 +420,13 @@ public class FileFontStrike extends PhysicalStrike {
 
     /* The following method is called from CompositeStrike as a special case.
      */
-    private static final int SLOTZEROMAX = 0xffffff;
     int getSlot0GlyphImagePtrs(int[] glyphCodes, long[] images, int len) {
 
         int convertedCnt = 0;
 
         for (int i=0; i<len; i++) {
             int glyphCode = glyphCodes[i];
-            if (glyphCode >= SLOTZEROMAX) {
+            if (glyphCode >>> 24 != 0) {
                 return convertedCnt;
             } else {
                 convertedCnt++;
diff --git a/jdk/src/java.desktop/unix/native/common/awt/fontpath.c b/jdk/src/java.desktop/unix/native/common/awt/fontpath.c
index cc317cdb10e..674931b4410 100644
--- a/jdk/src/java.desktop/unix/native/common/awt/fontpath.c
+++ b/jdk/src/java.desktop/unix/native/common/awt/fontpath.c
@@ -1219,10 +1219,11 @@ Java_sun_font_FontConfigManager_getFontConfig
                 minGlyphs = val;
             }
         }
+        FcCharSet *unionCharset = NULL;
         for (j=0; j<nfonts; j++) {
             FcPattern *fontPattern = fontset->fonts[j];
             FcChar8 *fontformat;
-            FcCharSet *unionCharset = NULL, *charset;
+            FcCharSet *charset = NULL;
 
             fontformat = NULL;
             (*FcPatternGetString)(fontPattern, FC_FONTFORMAT, 0, &fontformat);
@@ -1280,6 +1281,9 @@ Java_sun_font_FontConfigManager_getFontConfig
             if (!includeFallbacks) {
                 break;
             }
+            if (fontCount == 254) {
+                break; // CompositeFont will only use up to 254 slots from here.
+            }
         }
 
         /* Once we get here 'fontCount' is the number of returned fonts