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Received: from sslproxy04.your-server.de ([78.46.152.42]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1wtNDv-000Gp1-0U; Mon, 10 Aug 2026 12:27:15 +0200 Received: from localhost ([127.0.0.1]) by sslproxy04.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wtNDu-000Ea7-2t; Mon, 10 Aug 2026 12:27:14 +0200 Message-ID: Date: Mon, 10 Aug 2026 12:27:13 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] net: expect instance lock in netdev_queue_get_dma_dev() To: Jakub Kicinski , davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, stable@vger.kernel.org, syzbot+a78926bdac2adb52dc0e@syzkaller.appspotmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, asml.silence@gmail.com References: <20260806225627.3998672-1-kuba@kernel.org> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.4.3/28088/Mon Aug 10 08:24:15 2026) On 8/7/26 12:56 AM, Jakub Kicinski wrote: > netdev_queue_get_dma_dev() uses "compat" locking assert which wants > either the rtnl_lock or netdev instance lock. This is not right, > the callers are taking the instance lock unconditionally. All entry > points for queue config are purely instance locked. > > In other words the callers use netdev_get_by_index_lock(), not > netdev_get_by_index_lock_ops_compat(). All the state we will > access is effectively instance lock protected (it's const for > devices which are not ops-locked). > > Update the assert to avoid false positive warnings. > > Cc: stable@vger.kernel.org > Fixes: b6c5f9454ef34 ("io_uring/zcrx: call netdev_queue_get_dma_dev() under instance lock") > Reported-by: syzbot+a78926bdac2adb52dc0e@syzkaller.appspotmail.com > Signed-off-by: Jakub Kicinski Acked-by: Daniel Borkmann