From 6b6754af9895bf5ec3f73829a3b77f56db78a332 Mon Sep 17 00:00:00 2001
From: Jinshan Xiong <jinshan.xiong@intel.com>
Date: Sat, 26 Nov 2016 11:24:56 -0500
Subject: [PATCH 1/1] LU-4423 lov: check return value of lov_sub_get()

Check return value of lov_sub_get() in lov_io_read_ahead().

Linux-commit: f99e73a5e3ff556bc69e5e592fee18d4cb7600dd

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: Ic5403664c649b8f41861cf1bbfc68ab9ef537a15
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/23618
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
---
 lustre/lov/lov_io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lustre/lov/lov_io.c b/lustre/lov/lov_io.c
index a0ee8e9..56e1ba1 100644
--- a/lustre/lov/lov_io.c
+++ b/lustre/lov/lov_io.c
@@ -587,6 +587,8 @@ static int lov_io_read_ahead(const struct lu_env *env,
 		RETURN(-EIO);
 
 	sub = lov_sub_get(env, lio, stripe);
+	if (IS_ERR(sub))
+		return PTR_ERR(sub);
 
 	lov_stripe_offset(loo->lo_lsm, cl_offset(obj, start), stripe, &suboff);
 	rc = cl_io_read_ahead(sub->sub_env, sub->sub_io,
-- 
1.8.3.1