tree 4d059d2930a924e304c6ada7276c1e7108646a1b
parent 9110fd8ba026471e7d7ee425e812f8c66107ebd4
author Yufen Yu <yuyufen@huawei.com> 1554186134 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1558801606 +0200

md: add mddev->pers to avoid potential NULL pointer dereference

commit ee37e62191a59d253fc916b9fc763deb777211e2 upstream.

When doing re-add, we need to ensure rdev->mddev->pers is not NULL,
which can avoid potential NULL pointer derefence in fallowing
add_bound_rdev().

Fixes: a6da4ef85cef ("md: re-add a failed disk")
Cc: Xiao Ni <xni@redhat.com>
Cc: NeilBrown <neilb@suse.com>
Cc: <stable@vger.kernel.org> # 4.4+
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>