Merge 4.8-rc5 into char-misc-next

We want the fixes in here for merging and testing.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index f35523d4fa3a..b803213d1307 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -114,9 +114,15 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
          * If buf != of->prealloc_buf, we don't know how
          * large it is, so cannot safely pass it to ->show
          */
-        if (pos || WARN_ON_ONCE(buf != of->prealloc_buf))
+        if (WARN_ON_ONCE(buf != of->prealloc_buf))
                 return 0;
         len = ops->show(kobj, of->kn->priv, buf);
+        if (pos) {
+                if (len <= pos)
+                        return 0;
+                len -= pos;
+                memmove(buf, buf + pos, len);
+        }
         return min(count, len);
 }