[PATCH 3.11 117/208] ceph: Add check returned value on func ceph_calc_ceph_pg.

[Luis Henriques]

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

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

From: majianpeng <majianpeng at gmail.com>

commit 2fbcbff1d6b9243ef71c64a8ab993bc3c7bb7af1 upstream.

Func ceph_calc_ceph_pg maybe failed.So add check for returned value.

Signed-off-by: Jianpeng Ma <majianpeng at gmail.com>
Reviewed-by: Sage Weil <sage at inktank.com>
Signed-off-by: Sage Weil <sage at inktank.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/ceph/ioctl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index a5ce62e..669622f 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -211,8 +211,12 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 	snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
 		 ceph_ino(inode), dl.object_no);
 
-	ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
-		ceph_file_layout_pg_pool(ci->i_layout));
+	r = ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
+				ceph_file_layout_pg_pool(ci->i_layout));
+	if (r < 0) {
+		up_read(&osdc->map_sem);
+		return r;
+	}
 
 	dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
 	if (dl.osd >= 0) {
-- 
1.8.3.2