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From: Eitan Adler <eadler@FreeBSD.org>
Date: Thu, 9 Feb 2012 21:06:47 +0000 (UTC)
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Subject: svn commit: r231306 - head/lib/libutil
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Author: eadler
Date: Thu Feb  9 21:06:47 2012
New Revision: 231306
URL: http://svn.freebsd.org/changeset/base/231306

Log:
  Fix NULL ptr dereference in setusercontext if pwd is null,
  LOGIN_SETPRIORITY is set, and setting the priority (rtprio or
  setpriority) fails.
  
  PR:		kern/164238
  Submitted by:	Alexander Wittig <alexander@wittig.name>
  Reviewed by:	des
  Approved by:	cperciva
  MFC after:	1 month

Modified:
  head/lib/libutil/login_class.c

Modified: head/lib/libutil/login_class.c
==============================================================================
--- head/lib/libutil/login_class.c	Thu Feb  9 20:57:36 2012	(r231305)
+++ head/lib/libutil/login_class.c	Thu Feb  9 21:06:47 2012	(r231306)
@@ -452,18 +452,21 @@ setusercontext(login_cap_t *lc, const st
 	    p = (rtp.prio > RTP_PRIO_MAX) ? 31 : p;
 	    if (rtprio(RTP_SET, 0, &rtp))
 		syslog(LOG_WARNING, "rtprio '%s' (%s): %m",
-		    pwd->pw_name, lc ? lc->lc_class : LOGIN_DEFCLASS);
+		    pwd ? pwd->pw_name : "-",
+		    lc ? lc->lc_class : LOGIN_DEFCLASS);
 	} else if (p < PRIO_MIN) {
 	    rtp.type = RTP_PRIO_REALTIME;
 	    rtp.prio = abs(p - PRIO_MIN + RTP_PRIO_MAX);
 	    p = (rtp.prio > RTP_PRIO_MAX) ? 1 : p;
 	    if (rtprio(RTP_SET, 0, &rtp))
 		syslog(LOG_WARNING, "rtprio '%s' (%s): %m",
-		    pwd->pw_name, lc ? lc->lc_class : LOGIN_DEFCLASS);
+		    pwd ? pwd->pw_name : "-",
+		    lc ? lc->lc_class : LOGIN_DEFCLASS);
 	} else {
 	    if (setpriority(PRIO_PROCESS, 0, (int)p) != 0)
 		syslog(LOG_WARNING, "setpriority '%s' (%s): %m",
-		    pwd->pw_name, lc ? lc->lc_class : LOGIN_DEFCLASS);
+		    pwd ? pwd->pw_name : "-",
+		    lc ? lc->lc_class : LOGIN_DEFCLASS);
 	}
     }