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From: Martin Blapp <mbr@FreeBSD.org>
Date: Sun, 10 Sep 2006 16:51:56 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Subject: cvs commit: src/sys/kern tty.c
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mbr         2006-09-10 16:51:56 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             tty.c 
  Log:
  Fix locking race in ttymodem(). The locking of the proctree happens too late
  and opens a small race window before tp->t_session->s_leader is accessed. In case
  tp->t_session has just been set to NULL elsewhere, we get a panic().
  
  This fix is a bandaid until someone else fixes the whole locking in the tty subsystem.
  Definitly more work needs to be done.
  
  MFC after:      1 week
  Reviewed by:    mlaier
  PR:             kern/103101
  
  Revision  Changes    Path
  1.258     +2 -2      src/sys/kern/tty.c