linux-kernel - [PATCH 4.4 52/53] xfs: in _attrlist_by_handle, copy the cursor back to userspace

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Date:   Mon,  5 Jun 2017 18:17:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Dave Chinner <david@...morbit.com>,
        Nikolay Borisov <nborisov@...e.com>
Subject: [PATCH 4.4 52/53] xfs: in _attrlist_by_handle, copy the cursor back to userspace

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Darrick J. Wong <darrick.wong@...cle.com>

commit 0facef7fb053be4353c0a48c2f48c9dbee91cb19 upstream.

When we're iterating inode xattrs by handle, we have to copy the
cursor back to userspace so that a subsequent invocation actually
retrieves subsequent contents.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Dave Chinner <david@...morbit.com>
Cc: Nikolay Borisov <nborisov@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/xfs/xfs_ioctl.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -403,6 +403,7 @@ xfs_attrlist_by_handle(
 {
 	int			error = -ENOMEM;
 	attrlist_cursor_kern_t	*cursor;
+	struct xfs_fsop_attrlist_handlereq __user	*p = arg;
 	xfs_fsop_attrlist_handlereq_t al_hreq;
 	struct dentry		*dentry;
 	char			*kbuf;
@@ -435,6 +436,11 @@ xfs_attrlist_by_handle(
 	if (error)
 		goto out_kfree;

+	if (copy_to_user(&p->pos, cursor, sizeof(attrlist_cursor_kern_t))) {
+		error = -EFAULT;
+		goto out_kfree;
+	}
+
 	if (copy_to_user(al_hreq.buffer, kbuf, al_hreq.buflen))
 		error = -EFAULT;