cvs commit: src/sys/kern tty.c

[Martin Blapp]

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