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[XFS updates] XFS development tree branch, master, updated. v3.1-rc1-69-

To: xfs@xxxxxxxxxxx
Subject: [XFS updates] XFS development tree branch, master, updated. v3.1-rc1-69-ge49f565
From: xfs@xxxxxxxxxxx
Date: Tue, 27 Sep 2011 09:25:55 -0500
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The branch, master has been updated
  e49f565 xfs: fix possible overflow in xfs_ioc_trim()
      from  ef49624be283c67c40dcdac94ca125e1ddda8ff6 (commit)

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- Log -----------------------------------------------------------------
commit e49f565973deb3408c0e1dd83d1f8dac5bcaa374
Author: Lukas Czerner <lczerner@xxxxxxxxxx>
Date:   Wed Sep 21 09:42:30 2011 +0000

    xfs: fix possible overflow in xfs_ioc_trim()
    
    In xfs_ioc_trim it is possible that computing the last allocation group
    to discard might overflow for big start & len values, because the result
    might be bigger then xfs_agnumber_t which is 32 bit long. Fix this by not
    allowing the start and end block of the range to be beyond the end of the
    file system.
    
    Note that if the start is beyond the end of the file system we have to
    return -EINVAL, but in the "end" case we have to truncate it to the fs
    size.
    
    Also introduce "end" variable, rather than using start+len which which
    might be more confusing to get right as this bug shows.
    
    Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
    Reviewed-by: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Alex Elder <aelder@xxxxxxx>

-----------------------------------------------------------------------

Summary of changes:
 fs/xfs/xfs_discard.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)


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