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.

1 files changed, 10 insertions, 7 deletions

diff --git a/cpukit/rtems/src/partreturnbuffer.c b/cpukit/rtems/src/partreturnbuffer.c
index f5ab7d85f9..68302f1163 100644
--- a/cpukit/rtems/src/partreturnbuffer.c
+++ b/cpukit/rtems/src/partreturnbuffer.c
@@ -33,7 +33,7 @@ static bool _Partition_Is_address_on_buffer_boundary(
 
   offset = _Addresses_Subtract(
     the_buffer,
-    the_partition->starting_address
+    the_partition->base_address
   );
 
   return ( offset % the_partition->buffer_size ) == 0;
@@ -44,14 +44,17 @@ static bool _Partition_Is_address_a_buffer_begin(
    const void              *the_buffer
 )
 {
-  void *starting;
-  void *ending;
+  const void *base;
+  const void *limit;
 
-  starting = the_partition->starting_address;
-  ending   = _Addresses_Add_offset( starting, the_partition->length );
+  base = the_partition->base_address;
+  limit = the_partition->limit_address;
 
-  return _Addresses_Is_in_range( the_buffer, starting, ending )
-    && _Partition_Is_address_on_buffer_boundary( the_partition, the_buffer );
+  if ( !_Addresses_Is_in_range( the_buffer, base, limit ) ) {
+    return false;
+  }
+
+  return _Partition_Is_address_on_buffer_boundary( the_partition, the_buffer );
 }
 
 static void _Partition_Free_buffer(