[rtems commit] rtems: Fix rtems_partition_return_buffer()

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    9399e12c217343545bf412a01629570377536b39
Changeset: http://git.rtems.org/rtems/commit/?id=9399e12c217343545bf412a01629570377536b39

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Tue Aug 10 12:42:11 2021 +0200

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/include/rtems/monitor.h        |  2 +-
 cpukit/include/rtems/rtems/partdata.h | 15 ++++++++++-----
 cpukit/libmisc/monitor/mon-part.c     |  5 +++--
 cpukit/rtems/src/partcreate.c         |  8 ++++++--
 cpukit/rtems/src/partreturnbuffer.c   | 17 ++++++++++-------
 5 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/cpukit/include/rtems/monitor.h b/cpukit/include/rtems/monitor.h
index d0a79c0..9367e2b 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 73babd3..196c214 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.
diff --git a/cpukit/libmisc/monitor/mon-part.c b/cpukit/libmisc/monitor/mon-part.c
index 18034cd..654700e 100644
--- a/cpukit/libmisc/monitor/mon-part.c
+++ b/cpukit/libmisc/monitor/mon-part.c
@@ -22,8 +22,9 @@ rtems_monitor_part_canonical(
     const Partition_Control *rtems_part = (const Partition_Control *) part_void;
 
     canonical_part->attribute = rtems_part->attribute_set;
-    canonical_part->start_addr = rtems_part->starting_address;
-    canonical_part->length = rtems_part->length;
+    canonical_part->start_addr = rtems_part->base_address;
+    canonical_part->length = (uint32_t) ( (uintptr_t)
+        rtems_part->limit_address + 1 - (uintptr_t) rtems_part->base_address );
     canonical_part->buf_size = rtems_part->buffer_size;
     canonical_part->used_blocks = rtems_part->number_of_used_blocks;
 }
diff --git a/cpukit/rtems/src/partcreate.c b/cpukit/rtems/src/partcreate.c
index 012a416..6124974 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 f5ab7d8..68302f1 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(