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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Fri, 16 Feb 2018 15:52:28 +0000 (UTC)
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Subject: svn commit: r329377 - head/sys/compat/linuxkpi/common/include/linux
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Author: hselasky
Date: Fri Feb 16 15:52:28 2018
New Revision: 329377
URL: https://svnweb.freebsd.org/changeset/base/329377

Log:
  Implement memdup_user_nul() in the LinuxKPI.
  
  MFC after:	1 week
  Submitted by:	Johannes Lundberg <johalun0@gmail.com>
  Sponsored by:	Mellanox Technologies

Modified:
  head/sys/compat/linuxkpi/common/include/linux/string.h

Modified: head/sys/compat/linuxkpi/common/include/linux/string.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/string.h	Fri Feb 16 15:41:16 2018	(r329376)
+++ head/sys/compat/linuxkpi/common/include/linux/string.h	Fri Feb 16 15:52:28 2018	(r329377)
@@ -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;