From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 12 Dec 2013 04:07:51 +0000 (-0500)
Subject: btrfs: sanitize BTRFS_IOC_FILE_EXTENT_SAME
X-Git-Tag: v3.14-rc1~78^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c1c8747cd0528fe1d225badf25bf5346d799ea3;p=pandora-kernel.git

btrfs: sanitize BTRFS_IOC_FILE_EXTENT_SAME

* don't assume that ->dest_count won't change between copy_from_user()
and memdup_user()
* use fdget instead of fget
* don't bother comparing superblocks when we'd already compared vfsmounts
* get rid of excessive goto
* use file_inode() instead of open-coding the sucker

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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