Index: /trunk/src/VBox/VMM/VMMR0/GMMR0.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR0/GMMR0.cpp	(revision 92342)
+++ /trunk/src/VBox/VMM/VMMR0/GMMR0.cpp	(revision 92343)
@@ -2028,5 +2028,6 @@
         {
             idChunk = ASMBitNextClear(&pGMM->bmChunkId[0], GMM_CHUNKID_LAST + 1, idChunk);
-            if (idChunk > NIL_GMM_CHUNKID)
+            if (   idChunk > NIL_GMM_CHUNKID
+                && (uint32_t)idChunk <= GMM_CHUNKID_LAST)
             {
                 AssertMsgReturnStmt(!ASMAtomicBitTestAndSet(&pGMM->bmChunkId[0], idChunk), ("%#x\n", idChunk),
@@ -2045,5 +2046,5 @@
      */
     idChunk = ASMBitFirstClear(&pGMM->bmChunkId[0], GMM_CHUNKID_LAST + 1);
-    AssertMsgReturnStmt(idChunk > NIL_GMM_CHUNKID && idChunk <= GMM_CHUNKID_LAST, ("%#x\n", idChunk),
+    AssertMsgReturnStmt(idChunk > NIL_GMM_CHUNKID && (uint32_t)idChunk <= GMM_CHUNKID_LAST, ("%#x\n", idChunk),
                         RTSpinlockRelease(pGMM->hSpinLockChunkId), NIL_GVM_HANDLE);
     AssertMsgReturnStmt(!ASMAtomicBitTestAndSet(&pGMM->bmChunkId[0], idChunk), ("%#x\n", idChunk),