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From: "Kenneth D. Merry" <ken@FreeBSD.org>
Date: Tue, 7 Jun 2011 05:04:37 +0000 (UTC)
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Subject: cvs commit: src/sys/kern subr_prf.c
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ken         2011-06-07 05:04:37 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_prf.c 
  Log:
  SVN rev 222804 on 2011-06-07 05:04:37Z by ken
  
  Set pca.p_bufr to NULL when we haven't allocated a buffer.
  
  Otherwise, p_bufr is set to garbage on the stack, and if that garbage
  happens to be non-NULL, and the TOLOG or TOCONS flag is set, putbuf()
  will get called and attempt to fill the non-existent buffer.
  
  This is really only relevant for tprintf() (and only when the priority is
  not -1), but set it in uprintf() and ttyprintf() for completeness.
  
  The next step, to avoid log buffer scrambling, would be to add the
  PRINTF_BUFR_SIZE code to tprintf(), but this should prevent panics.
  
  Submitted by:   rmacklem
  Found by:       pho
  
  Revision  Changes    Path
  1.143     +3 -0      src/sys/kern/subr_prf.c