From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Wed, 3 Aug 2016 00:58:53 +0000 (+1000)
Subject: xfs: in _attrlist_by_handle, copy the cursor back to userspace
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0facef7fb053b;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

xfs: in _attrlist_by_handle, copy the cursor back to userspace

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@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
---

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 9a7c87809d3b..cf46658392ce 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -387,6 +387,7 @@ 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;
@@ -419,6 +420,11 @@ 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;