We add rdev->mddev->pers to avoid potential NULL pointer derefence
in fallowing add_bound_rdev().
Cc: Xiao Ni <xni@xxxxxxxxxx>
Cc: NeilBrown <neilb@xxxxxxxx>
Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx>
---
drivers/md/md.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 875b29ba5926..96cdad28a0d2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2859,8 +2859,8 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
err = 0;
}
} else if (cmd_match(buf, "re-add")) {
- if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) &&
- rdev->saved_raid_disk >= 0) {
+ if (rdev->mddev->pers && test_bit(Faulty, &rdev->flags) &&
+ (rdev->raid_disk == -1) && rdev->saved_raid_disk >= 0) {
/* clear_bit is performed _after_ all the devices
* have their local Faulty bit cleared. If any writes
* happen in the meantime in the local node, they
--
2.16.2.dirty
