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From: Alexander Kabaev <kan@FreeBSD.org>
Date: Sat, 23 Dec 2017 16:45:24 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r327111 - head/sys/net
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Author: kan
Date: Sat Dec 23 16:45:24 2017
New Revision: 327111
URL: https://svnweb.freebsd.org/changeset/base/327111

Log:
  Do not pass NULL pointer to copyout in if_clone_list.
  
  Sometimes caller is only interested in how many clones
  are there and NULL pointer is passed for the destination
  buffer. Do not pass it to copyout then.

Modified:
  head/sys/net/if_clone.c

Modified: head/sys/net/if_clone.c
==============================================================================
--- head/sys/net/if_clone.c	Sat Dec 23 16:24:02 2017	(r327110)
+++ head/sys/net/if_clone.c	Sat Dec 23 16:45:24 2017	(r327111)
@@ -508,7 +508,7 @@ if_clone_list(struct if_clonereq *ifcr)
 
 done:
 	IF_CLONERS_UNLOCK();
-	if (err == 0)
+	if (err == 0 && dst != NULL)
 		err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
 	if (outbuf != NULL)
 		free(outbuf, M_CLONE);