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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 30 May 2008 11:13:30 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: RELENG_7
Cc: 
Subject: cvs commit: src/sys/kern tty.c
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kib         2008-05-30 11:13:30 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/kern             tty.c 
  Log:
  MFC rev. 1.280:
  
  Rev. 1.274 put the ttyrel() call before the destroy_dev() in the
  ttyfree(), freeing the tty. Since destroy_dev() may call d_purge()
  cdevsw method, that is the ttypurge() for the tty, the code ends up
  accessing freed tty structure.
  
  Put the ttyrel() after destroy_dev() in the ttyfree. To prevent the
  panic the rev. 1.274 provided fix for, check the TS_GONE in sysctl
  handler and refuse to provide information on such tty.
  
  Revision   Changes    Path
  1.273.2.4  +5 -2      src/sys/kern/tty.c