diff -rubB lcms-1.18-orig/include/lcms.h lcms-1.18/include/lcms.h
--- lcms-1.18-orig/include/lcms.h	2009-02-17 06:01:16.000000000 -0800
+++ lcms-1.18/include/lcms.h	2009-03-03 13:43:28.000000000 -0800
@@ -1423,7 +1423,10 @@
 LCMS_INLINE void* _cmsCalloc(size_t nmemb, size_t size)
 {
     size_t alloc = nmemb * size;
-    if (alloc < nmemb || alloc < size) {
+    if (size == 0) {
+      return _cmsMalloc(0);
+    }
+    if (alloc / size != nmemb) {
         return NULL;
     }
     return _cmsMalloc(alloc);
diff -rubB lcms-1.18-orig/src/cmsio0.c lcms-1.18/src/cmsio0.c
--- lcms-1.18-orig/src/cmsio0.c	2009-02-17 06:02:15.000000000 -0800
+++ lcms-1.18/src/cmsio0.c	2009-03-03 13:37:29.000000000 -0800
@@ -77,7 +77,11 @@
      size_t len = size * count;
      size_t extent = ResData -> Pointer + len;
 
-      if (len < size || len < count) {
+      if (len == 0) {
+          return 0;
+      }
+
+      if (len / size != count) {
           cmsSignalError(LCMS_ERRC_ABORTED, "Read from memory error. Integer overflow with count / size.");
           return 0;
       }
diff -rubB lcms-1.18-orig/src/cmslut.c lcms-1.18/src/cmslut.c
--- lcms-1.18-orig/src/cmslut.c	2009-02-17 06:06:43.000000000 -0800
+++ lcms-1.18/src/cmslut.c	2009-03-03 13:38:18.000000000 -0800
@@ -200,14 +200,14 @@
       oldCalc = calc;
       calc *= NewLUT -> cLutPoints;
 
-      if (calc < oldCalc || calc < NewLUT -> cLutPoints) {
+      if (calc / NewLUT -> cLutPoints != oldCalc) {
         return FALSE;
       }
     }
 
     oldCalc = calc;
     calc *= NewLUT -> OutputChan;
-    if (calc < oldCalc || calc < NewLUT -> OutputChan) {
+    if (NewLUT -> OutputChan && calc / NewLUT -> OutputChan != oldCalc) {
       return FALSE;
     }