[PATCH] bsps/shared/ofw: Fix coverity defects

[G S Niteesh Babu]

This patch adds asserts to fix coverity defects
1) CID 1474437 (Out-of-bounds access)
2) CID 1474436 (Out-of-bounds access)

>From manual inspection, out of bounds access cannot occur due to
bounds checking but coverity fails to detect the checks.
We are adding asserts as a secondary check.
---
 bsps/shared/ofw/ofw.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/bsps/shared/ofw/ofw.c b/bsps/shared/ofw/ofw.c
index f4b8b63931..808fa85d81 100644
--- a/bsps/shared/ofw/ofw.c
+++ b/bsps/shared/ofw/ofw.c
@@ -42,6 +42,7 @@
 #include <assert.h>
 #include <rtems/sysinit.h>
 #include <ofw/ofw_test.h>
+#include <rtems/score/assert.h>
 
 static void *fdtp = NULL;
 
@@ -186,6 +187,7 @@ ssize_t rtems_ofw_get_prop(
   const void *prop;
   int offset;
   int len;
+  int copy_len;
   uint32_t cpuid;
 
   offset = rtems_fdt_phandle_to_offset(node);
@@ -226,7 +228,9 @@ ssize_t rtems_ofw_get_prop(
     return -1;
   }
 
-  bcopy(prop, buf, MIN(len, bufsize));
+  copy_len = MIN(len, bufsize);
+  _Assert(copy_len <= bufsize);
+  memmove(prop, buf, copy_len);
 
   return len;
 }
@@ -637,6 +641,12 @@ int rtems_ofw_get_reg(
         range.child_bus = fdt32_to_cpu(ptr[j].child_bus);
         range.size = fdt32_to_cpu(ptr[j].size);
 
+        /*
+         * buf[i + 1] should upperbound the access for buf[i].
+         * Thus by making sure buf[i + 1] <= (buf + size) we
+         * can be sure buf[i] will always be inbounds.
+         */
+        _Assert(buf[i + 1] <= (buf + size));
         if (buf[i].start >= range.child_bus &&
             buf[i].start < range.child_bus + range.size) {
           offset = range.parent_bus - range.child_bus;
-- 
2.17.1