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xfs: don't allow reflinked dir/dev/fifo/socket/pipe files

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Only non-rt files can be reflinked, so check that when we load an
inode.  Also, don't leak the attr fork if there's a failure.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:31 -07:00
parent f0ec1b8ef1
commit 11715a21bc
1 changed files with 22 additions and 1 deletions
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23
fs/xfs/libxfs/xfs_inode_fork.c
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@ -121,6 +121,26 @@ xfs_iformat_fork(
return -EFSCORRUPTED;
}
if (unlikely(xfs_is_reflink_inode(ip) &&
(VFS_I(ip)->i_mode & S_IFMT) != S_IFREG)) {
xfs_warn(ip->i_mount,
"corrupt dinode %llu, wrong file type for reflink.",
ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_iformat(reflink)",
XFS_ERRLEVEL_LOW, ip->i_mount, dip);
return -EFSCORRUPTED;
}
if (unlikely(xfs_is_reflink_inode(ip) &&
(ip->i_d.di_flags & XFS_DIFLAG_REALTIME))) {
xfs_warn(ip->i_mount,
"corrupt dinode %llu, has reflink+realtime flag set.",
ip->i_ino);
XFS_CORRUPTION_ERROR("xfs_iformat(reflink)",
XFS_ERRLEVEL_LOW, ip->i_mount, dip);
return -EFSCORRUPTED;
}
switch (VFS_I(ip)->i_mode & S_IFMT) {
case S_IFIFO:
case S_IFCHR:
@ -208,7 +228,8 @@ xfs_iformat_fork(
XFS_CORRUPTION_ERROR("xfs_iformat(8)",
XFS_ERRLEVEL_LOW,
ip->i_mount, dip);
return -EFSCORRUPTED;
error = -EFSCORRUPTED;
break;
}
error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size);