linux-kernel - Re: [PATCH V1] block: Fix null pointer dereference issue on struct io

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Message-ID: <ZGScoCeOILHpc8c1@infradead.org>
Date:   Wed, 17 May 2023 02:21:36 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Damien Le Moal <dlemoal@...nel.org>
Cc:     Yu Kuai <yukuai1@...weicloud.com>,
        Pradeep P V K <quic_pragalla@...cinc.com>, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH V1] block: Fix null pointer dereference issue on struct
 io_cq

On Wed, May 17, 2023 at 06:20:19PM +0900, Damien Le Moal wrote:
> twice for the same icq. The missing rcu lock in ioc_exit_icqs() already was in
> itself a bug, and the missing flag check is another.

spinlocks imply a rcu critical section, no need to duplicate it.