Commit 5d881783 authored Jul 28, 2016 by 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: kernel test robot <xiaolong.ye@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>

parent 0e5313e2

drivers/md/md.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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 {