diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 08e7efe79..6223194bb 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2003-10-27  Corinna Vinschen  <corinna@vinschen.de>
+
+	* miscfunc.cc (__check_invalid_read_ptr): New function.
+	* winsup.h: Declare.
+
 2003-10-26  Corinna Vinschen  <corinna@vinschen.de>
 
 	* security.h (cygpsid::debug_print): Avoid compiler warnings.
diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc
index d9e4a7adb..be7c8a30e 100644
--- a/winsup/cygwin/miscfuncs.cc
+++ b/winsup/cygwin/miscfuncs.cc
@@ -198,6 +198,14 @@ __check_null_invalid_struct_errno (void *s, unsigned sz)
   return err;
 }
 
+int __stdcall
+__check_invalid_read_ptr (const void *s, unsigned sz)
+{
+  if (s && !IsBadReadPtr (s, sz))
+    return 0;
+  return EFAULT;
+}
+
 int __stdcall
 __check_invalid_read_ptr_errno (const void *s, unsigned sz)
 {
diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index 745519ea1..305b621db 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -250,6 +250,7 @@ int __stdcall check_null_empty_str_errno (const char *name) __attribute__ ((regp
 int __stdcall check_null_str_errno (const char *name) __attribute__ ((regparm(1)));
 int __stdcall __check_null_invalid_struct (void *s, unsigned sz) __attribute__ ((regparm(2)));
 int __stdcall __check_null_invalid_struct_errno (void *s, unsigned sz) __attribute__ ((regparm(2)));
+int __stdcall __check_invalid_read_ptr (const void *s, unsigned sz) __attribute__ ((regparm(2)));
 int __stdcall __check_invalid_read_ptr_errno (const void *s, unsigned sz) __attribute__ ((regparm(2)));
 
 #define check_null_invalid_struct(s) \