rtems: Fix rtems_partition_return_buffer()

The rtems_partition_return_buffer() wrongly accepted which were exactly
at the buffer area end.  Use the buffer area limit address for the range
checking.

Close #4490.

2 files changed, 11 insertions, 6 deletions

diff --git a/cpukit/include/rtems/monitor.h b/cpukit/include/rtems/monitor.h
index d0a79c03be..9367e2b6e8 100644
--- a/cpukit/include/rtems/monitor.h
+++ b/cpukit/include/rtems/monitor.h
@@ -192,7 +192,7 @@ typedef struct {
     rtems_name          name;
   /* end of common portion */
   rtems_attribute     attribute;
-  void *              start_addr;
+  const void *        start_addr;
   uint32_t            length;
   uint32_t            buf_size;
   uint32_t            used_blocks;
diff --git a/cpukit/include/rtems/rtems/partdata.h b/cpukit/include/rtems/rtems/partdata.h
index 73babd36f4..196c2142ae 100644
--- a/cpukit/include/rtems/rtems/partdata.h
+++ b/cpukit/include/rtems/rtems/partdata.h
@@ -48,15 +48,20 @@ typedef struct {
   ISR_LOCK_MEMBER( Lock )
 
   /**
-   * @brief This member contains the physical starting address of the buffer
-   *   area.
+   * @brief This member contains the base address of the buffer area.
+   *
+   * The base address is the address of the first byte contained in the buffer
+   * area.
    */
-  void *starting_address;
+  const void *base_address;
 
   /**
-   * @brief This member contains the size of the buffer area in bytes.
+   * @brief This member contains the limit address of the buffer area.
+   *
+   * The limit address is the address of the last byte contained in the buffer
+   * area.
    */
-  uintptr_t length;
+  const void *limit_address;
 
   /**
    * @brief This member contains the size of each buffer in bytes.