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MD: fix null pointer deference 

The md device might not have personality (for example, ddf raid array). The
issue is introduced by 8430e7e0af9a15(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>
This commit is contained in:
Shaohua Li 2016-07-28 09:06:34 -07:00
parent 0e5313e2d4
commit 5d8817833c
1 changed files with 4 additions and 2 deletions
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6
drivers/md/md.c
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@ -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")) {
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(rdev->mddev, rdev);
if (rdev->mddev->pers) {
clear_bit(Blocked, &rdev->flags);
remove_and_add_spares(rdev->mddev, rdev);
}
if (rdev->raid_disk >= 0)
err = -EBUSY;
else {