svn commit: r329954 - stable/11/sys/compat/linuxkpi/common/include/linux

[Hans Petter Selasky]

Author: hselasky
Date: Sun Feb 25 10:18:49 2018
New Revision: 329954
URL: https://svnweb.freebsd.org/changeset/base/329954

Log:
  MFC r329377:
  Implement memdup_user_nul() in the LinuxKPI.
  
  Submitted by:	Johannes Lundberg <johalun0 at gmail.com>
  Sponsored by:	Mellanox Technologies

Modified:
  stable/11/sys/compat/linuxkpi/common/include/linux/string.h
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/compat/linuxkpi/common/include/linux/string.h
==============================================================================
--- stable/11/sys/compat/linuxkpi/common/include/linux/string.h	Sun Feb 25 10:18:02 2018	(r329953)
+++ stable/11/sys/compat/linuxkpi/common/include/linux/string.h	Sun Feb 25 10:18:49 2018	(r329954)
@@ -71,6 +71,22 @@ memdup_user(const void *ptr, size_t len)
 }
 
 static inline void *
+memdup_user_nul(const void *ptr, size_t len)
+{
+	char *retval;
+	int error;
+
+	retval = malloc(len + 1, M_KMALLOC, M_WAITOK);
+	error = linux_copyin(ptr, retval, len);
+	if (error != 0) {
+		free(retval, M_KMALLOC);
+		return (ERR_PTR(error));
+	}
+	retval[len] = '\0';
+	return (retval);
+}
+
+static inline void *
 kmemdup(const void *src, size_t len, gfp_t gfp)
 {
 	void *dst;