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quota: protect Q_GETFMT by dqonoff_mutex
dqptr_sem will go away. Protect Q_GETFMT quotactl by dqonoff_mutex instead. This is also enough to make sure quota info will not go away while we are looking at it. Signed-off-by: Lai Siyao <lai.siyao@intel.com> Signed-off-by: Niu Yawei <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
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@ -79,13 +79,13 @@ static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
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{
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__u32 fmt;
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down_read(&sb_dqopt(sb)->dqptr_sem);
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mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
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if (!sb_has_quota_active(sb, type)) {
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up_read(&sb_dqopt(sb)->dqptr_sem);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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return -ESRCH;
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}
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fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
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up_read(&sb_dqopt(sb)->dqptr_sem);
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mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
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if (copy_to_user(addr, &fmt, sizeof(fmt)))
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return -EFAULT;
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return 0;
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