4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> 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@xxxxxxxxx Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -487,7 +487,14 @@ 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 ||
