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From: Luiz Otavio O Souza <loos@FreeBSD.org>
Date: Sat, 5 Jul 2014 20:16:02 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r268301 - head/sbin/etherswitchcfg
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Author: loos
Date: Sat Jul  5 20:16:02 2014
New Revision: 268301
URL: http://svnweb.freebsd.org/changeset/base/268301

Log:
  Check the number of returned entries before doing any access to ifm_ulist.

Modified:
  head/sbin/etherswitchcfg/etherswitchcfg.c

Modified: head/sbin/etherswitchcfg/etherswitchcfg.c
==============================================================================
--- head/sbin/etherswitchcfg/etherswitchcfg.c	Sat Jul  5 20:08:35 2014	(r268300)
+++ head/sbin/etherswitchcfg/etherswitchcfg.c	Sat Jul  5 20:16:02 2014	(r268301)
@@ -235,6 +235,8 @@ set_port_media(struct cfg *cfg, char *ar
 	p.es_ifmr.ifm_count = IFMEDIAREQ_NULISTENTRIES;
 	if (ioctl(cfg->fd, IOETHERSWITCHGETPORT, &p) != 0)
 		err(EX_OSERR, "ioctl(IOETHERSWITCHGETPORT)");
+	if (p.es_ifmr.ifm_count == 0)
+		return;
 	subtype = get_media_subtype(IFM_TYPE(ifm_ulist[0]), argv[1]);
 	p.es_ifr.ifr_media = (p.es_ifmr.ifm_current & IFM_IMASK) |
 	        IFM_TYPE(ifm_ulist[0]) | subtype;