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From: Robert Watson <rwatson@FreeBSD.org>
Date: Thu, 23 Apr 2009 18:23:08 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_7_2
Subject: cvs commit: src/sys/net if_mib.c
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rwatson     2009-04-23 18:23:08 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7_2)
    sys/net              if_mib.c 
  Log:
  SVN rev 191435 on 2009-04-23 18:23:08Z by rwatson
  
  Merge r191434 from stable/7 to releng/7.2:
  
    In sysctl_ifdata(), query the ifnet pointer using the index only
    once, rather than querying it, validating it, and then re-querying
    it without validating it.  This may avoid a NULL pointer
    dereference and resulting kernel page fault if an interface is
    being deleted while bsnmp or other tools are querying data on the
    interface.
  
    The full fix, to properly refcount the interface for the duration
    of the sysctl, is in 8.x, but is considered too high-risk for
    7.2, so instead will appear in 7.3 (if all goes well).
  
    Reported by:  mdtancsa
  
  Approved by:    re (kensmith)
  
  Revision  Changes    Path
  1.18.8.2  +1 -3      src/sys/net/if_mib.c