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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 20 Apr 2009 14:36:01 +0000 (UTC)
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Subject: cvs commit: src/sys/ufs/ufs ufs_extern.h ufs_lookup.c ufs_vnops.c
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kib         2009-04-20 14:36:01 UTC

  FreeBSD src repository

  Modified files:
    sys/ufs/ufs          ufs_extern.h ufs_lookup.c ufs_vnops.c 
  Log:
  SVN rev 191315 on 2009-04-20 14:36:01Z by kib
  
  In ufs_checkpath(), recheck that '..' still points to the inode with
  the same inode number after VFS_VGET() and relock of the vp. If '..'
  changed, redo the lookup. To reduce code duplication, move the code to
  read '..' dirent into the static helper function ufs_dir_dd_ino().
  
  Supply the source inode number as an argument to ufs_checkpath() instead
  of the source inode itself. The inode is unlocked, thus it might be
  reclaimed, causing accesses to the freed memory.
  
  Use vn_vget_ino() to get the '..' vnode by its inode number, instead of
  directly code VFS_VGET() and relock, to properly busy the mount point
  while vp lock is dropped.
  
  Noted and reviewed by:  tegge
  Tested by:      pho
  MFC after:      1 month
  
  Revision  Changes    Path
  1.56      +1 -1      src/sys/ufs/ufs/ufs_extern.h
  1.98      +51 -39    src/sys/ufs/ufs/ufs_lookup.c
  1.311     +3 -1      src/sys/ufs/ufs/ufs_vnops.c