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btrfs: check file extent backref offset underflow
author
Yan, Zheng
<zheng.z.yan@intel.com>
Mon, 29 Aug 2011 01:25:53 +0000
(09:25 +0800)
committer
David Sterba
<dsterba@suse.cz>
Thu, 20 Oct 2011 16:10:31 +0000
(18:10 +0200)
Offset field in data extent backref can underflow if clone range ioctl
is used. We can reliably detect the underflow because max file size is
limited to 2^63 and max data extent size is limited by block group size.
Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
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git.openpandora.org / pandora-kernel.git / commitdiff