linux-kernel - Re: [PATCH] opp: fix a missing check on list iterator

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Message-ID: <20220328085057.ikn3mcyz2gbftkg4@vireshk-i7>
Date:   Mon, 28 Mar 2022 14:20:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Xiaomeng Tong <xiam0nd.tong@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, nm@...com,
        rafael.j.wysocki@...el.com, sboyd@...nel.org,
        stable@...r.kernel.org, vireshk@...nel.org
Subject: Re: [PATCH] opp: fix a missing check on list iterator

On 28-03-22, 15:43, Xiaomeng Tong wrote:
> No. the conditon to call opp_migrate_dentry(opp_dev, opp_table); is:
> if (!list_is_singular(&opp_table->dev_list)), 
> 
> while list_is_singlular is: !list_empty(head) && (head->next == head->prev);
> 
> so the condition is: list_empty(head) || (head->next != head->prev)
> 
> if the list is empty, the bug can be triggered.

List can't be empty here by design. It will be a huge bug in that
case, which should lead to crash somewhere.

-- 
viresh