Fix a double free when re-allocating a buffer to size 0.

	PR 27797
	* libbfd.c (bfd_realloc_or_free): Do not free a pointer than has
	been realloc'ed to size 0.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index cd904dac58630f0456ae6d9111ced52fafb5f9ad..548ed9f57d3cf31b26b8f2d7c77d28ff85331620 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2021-04-30  Nick Clifton  <nickc@redhat.com>
+
+       PR 27797
+       * libbfd.c (bfd_realloc_or_free): Do not free a pointer than has
+       been realloc'ed to size 0.
+
 2021-04-30  Nick Clifton  <nickc@redhat.com>
 
        PR 27795

diff --git a/bfd/libbfd.c b/bfd/libbfd.c
index 9db14c3c22fd071c03edb451a8052b47ace20f7f..52c924560b2de80a8ccaa6fcf1874f57a090f05b 100644 (file)
--- a/bfd/libbfd.c
+++ b/bfd/libbfd.c
@@ -312,7 +312,7 @@ bfd_realloc_or_free (void *ptr, bfd_size_type size)
 {
   void *ret = bfd_realloc (ptr, size);
 
-  if (ret == NULL)
+  if (ret == NULL && size > 0)
     free (ptr);
 
   return ret;