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btrfs: check file extent backref offset underflow
authorYan, Zheng <zheng.z.yan@intel.com>
Mon, 29 Aug 2011 01:25:53 +0000 (09:25 +0800)
committerDavid Sterba <dsterba@suse.cz>
Thu, 20 Oct 2011 16:10:31 +0000 (18:10 +0200)
commit84850e8d8a5ec7b9d3c47d224e9a10c9da52ff1b
tree799dd9e0b150361dc2a5cdf3772a0ce8395d5f06tree
parent016fc6a63e465d5b94e4028f6d05d9703e195428commit | diff
btrfs: check file extent backref offset underflow

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>
fs/btrfs/relocation.c diff | blob | blame | history
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