SERVER-6856 do not read past the end of a record

milkie · milkie · commit 9b6f04532b2c · 2012-08-27T13:52:55.000-04:00
diff --git a/src/mongo/db/prefetch.cpp b/src/mongo/db/prefetch.cpp
@@ -164,7 +164,7 @@ namespace mongo {
                         _dummy_char += *(result.objdata() + i); 
                     }
                     // hit the last page, in case we missed it above
-                    _dummy_char += *(result.objdata() + result.objsize());
+                    _dummy_char += *(result.objdata() + result.objsize() - 1);
                 }
             }
             catch(const DBException& e) {

Original file line number	Diff line number	Diff line change
`@@ -164,7 +164,7 @@ namespace mongo {`
`164`	`164`	`_dummy_char += *(result.objdata() + i);`
`165`	`165`	`}`
`166`	`166`	`// hit the last page, in case we missed it above`
`167`		`- _dummy_char += *(result.objdata() + result.objsize());`
	`167`	`+ _dummy_char += *(result.objdata() + result.objsize() - 1);`
`168`	`168`	`}`
`169`	`169`	`}`
`170`	`170`	`catch(const DBException& e) {`