4.4-stable review patch. If anyone has any objections, please let me know.
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From: Darrick J. Wong darrick.wong@oracle.com
commit 7b38460dc8e4eafba06c78f8e37099d3b34d473c upstream.
Kanda Motohiro reported that expanding a tiny xattr into a large xattr fails on XFS because we remove the tiny xattr from a shortform fork and then try to re-add it after converting the fork to extents format having not removed the ATTR_REPLACE flag. This fails because the attr is no longer present, causing a fs shutdown.
This is derived from the patch in his bug report, but we really shouldn't ignore a nonzero retval from the remove call.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199119 Reported-by: kanda.motohiro@gmail.com Reviewed-by: Dave Chinner dchinner@redhat.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Cc: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/xfs/libxfs/xfs_attr.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c @@ -528,7 +528,14 @@ xfs_attr_shortform_addname(xfs_da_args_t if (args->flags & ATTR_CREATE) return retval; retval = xfs_attr_shortform_remove(args); - ASSERT(retval == 0); + if (retval) + return retval; + /* + * Since we have removed the old attr, clear ATTR_REPLACE so + * that the leaf format add routine won't trip over the attr + * not being around. + */ + args->flags &= ~ATTR_REPLACE; }
if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||