1 files changed, 5 insertions, 0 deletions
diff --git a/db/pdfile.cpp b/db/pdfile.cpp
index ac7731a..60914d9 100644
--- a/db/pdfile.cpp
+++ b/db/pdfile.cpp
@@ -434,6 +434,7 @@ namespace mongo {
     }
 
     Extent* MongoDataFile::createExtent(const char *ns, int approxSize, bool newCapped, int loops) {
+        assert( approxSize <= Extent::maxSize() );
         {
             // make sizes align with VM page size
             int newSize = (approxSize + 0xfff) & 0xfffff000;
@@ -491,6 +492,10 @@ namespace mongo {
                 // overflowed
                 high = max(approxSize, Extent::maxSize());
             }
+            if ( high <= Extent::minSize() ) {
+                // the minimum extent size is 4097
+                high = Extent::minSize() + 1;
+            }
             int n = 0;
             Extent *best = 0;
             int bestDiff = 0x7fffffff;