From 9399e12c217343545bf412a01629570377536b39 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Tue, 10 Aug 2021 12:42:11 +0200
Subject: 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.
---
 cpukit/rtems/src/partcreate.c       |  8 ++++++--
 cpukit/rtems/src/partreturnbuffer.c | 17 ++++++++++-------
 2 files changed, 16 insertions(+), 9 deletions(-)

(limited to 'cpukit/rtems')

diff --git a/cpukit/rtems/src/partcreate.c b/cpukit/rtems/src/partcreate.c
index 012a416a1a..61249749f3 100644
--- a/cpukit/rtems/src/partcreate.c
+++ b/cpukit/rtems/src/partcreate.c
@@ -23,6 +23,7 @@
 #include <rtems/rtems/partimpl.h>
 #include <rtems/rtems/attrimpl.h>
 #include <rtems/rtems/support.h>
+#include <rtems/score/address.h>
 #include <rtems/score/chainimpl.h>
 #include <rtems/score/sysstate.h>
 #include <rtems/sysinit.h>
@@ -40,8 +41,11 @@ static void _Partition_Initialize(
   rtems_attribute    attribute_set
 )
 {
-  the_partition->starting_address      = starting_address;
-  the_partition->length                = length;
+  const void *limit_address;
+
+  limit_address = _Addresses_Add_offset( starting_address, length - 1 );
+  the_partition->base_address          = starting_address;
+  the_partition->limit_address         = limit_address;
   the_partition->buffer_size           = buffer_size;
   the_partition->attribute_set         = attribute_set;
   the_partition->number_of_used_blocks = 0;
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(
-- 
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