Commit 5d881783 authored by Shaohua Li's avatar Shaohua Li

MD: fix null pointer deference

The md device might not have personality (for example, ddf raid array). The
issue is introduced by 8430e7e0(md: disconnect device from personality
before trying to remove it)
Reported-by: default avatarkernel test robot <xiaolong.ye@intel.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 0e5313e2
......@@ -2595,8 +2595,10 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
else
err = -EBUSY;
} else if (cmd_match(buf, "remove")) {
if (rdev->mddev->pers) {
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(rdev->mddev, rdev);
}
if (rdev->raid_disk >= 0)
err = -EBUSY;
else {
......
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