ore: Don't crash on NULL bio in _clear_bio

In the case of target returning OSD_ERR_PRI_CLEAR_PAGES when we
only sent for attributes don't crash on NULL bio.
This is an osd-target bug but don't crash regardless

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 85cde3e76290..dae884694bd9 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -431,8 +431,12 @@ int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error)
                 if (likely(!ret))
                         continue;
 
-                if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
-                        /* start read offset passed endof file */
+                if ((OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) &&
+                    per_dev->bio) {
+                        /* start read offset passed endof file.
+                         * Note: if we do not have bio it means read-attributes
+                         * In this case we should return error to caller.
+                         */
                         _clear_bio(per_dev->bio);
                         ORE_DBGMSG("start read offset passed end of file "
                                 "offset=0x%llx, length=0x%llx\n",