svn commit: r299569 - user/ngie/ntb-hacking/sys/net

[Garrett Cooper]

Author: ngie
Date: Thu May 12 20:21:40 2016
New Revision: 299569
URL: https://svnweb.freebsd.org/changeset/base/299569

Log:
  Set ifp to NULL after calling free(9) in if_free_internal(..)
  
  This will ensure that the first thing that derefs the storage blows up
  instead of a random victim when it tries to use it after it's been free'd

Modified:
  user/ngie/ntb-hacking/sys/net/if.c

Modified: user/ngie/ntb-hacking/sys/net/if.c
==============================================================================
--- user/ngie/ntb-hacking/sys/net/if.c	Thu May 12 20:20:54 2016	(r299568)
+++ user/ngie/ntb-hacking/sys/net/if.c	Thu May 12 20:21:40 2016	(r299569)
@@ -489,6 +489,7 @@ if_free_internal(struct ifnet *ifp)
 		counter_u64_free(ifp->if_counters[i]);
 
 	free(ifp, M_IFNET);
+	ifp = NULL;
 }
 
 /*