svn commit: r344194 - stable/12/usr.sbin/jail

[Eugene Grosbein]

Author: eugen
Date: Sat Feb 16 00:38:25 2019
New Revision: 344194
URL: https://svnweb.freebsd.org/changeset/base/344194

Log:
  MFC r343112: jail(8): stop crashing with SIGSEGV inside run_command()
  function while processing not entirely correct jail.conf(5) file
  having something like "ip4.addr = 127.0.0.1;" and no "ip4 = ...;"
  so extrap variable stays NULL.
  
  Reported by:    marck

Modified:
  stable/12/usr.sbin/jail/command.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/usr.sbin/jail/command.c
==============================================================================
--- stable/12/usr.sbin/jail/command.c	Sat Feb 16 00:37:08 2019	(r344193)
+++ stable/12/usr.sbin/jail/command.c	Sat Feb 16 00:38:25 2019	(r344194)
@@ -374,7 +374,7 @@ run_command(struct cfjail *j)
 			argc = 4;
 		}
 
-		if (!down) {
+		if (!down && extrap != NULL) {
 			for (cs = strtok(extrap, " "); cs;
 			     cs = strtok(NULL, " ")) {
 				size_t len = strlen(cs) + 1;