From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83B042E628 for ; Tue, 17 Dec 2024 10:50:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734432633; cv=none; b=JDNAiy1x2NpXzrTwz+sWybsfoK/kpOvPvD7CsS5DnTPhX8ltRiuDAdg57yvnIu7bT5s19MJ2ieAlNTzq41fOt12EwCk1pQ/IKdlz649KpywRld9gGX3P25L1pNfKJ9h5pzSlBP/46XIJ0Qs2WkZb+A19QALJkYBt+jiHF2V/1lw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734432633; c=relaxed/simple; bh=/K+6iQ97D4aQYEqjFaog8Tw1ziqaUmh+aRZ81PoOjZ4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bGIy8X3nISSjfXah7P4hl5wGTewVzgdC8qhNDqmFRxA1BIkB5BUxoPRAuqNRhwmjRLqt0TBSL+PdrDp7U6u02T6DN1KAHgbTDecmBldbWPUAWMTtSnAPXzU+VE5y2kfQ7YOfiXdG2IsGO9hxkwgfHFGa4Z8+RC+sgtATK2olZI4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LOy20Zdz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LOy20Zdz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53EB8C4CED3; Tue, 17 Dec 2024 10:50:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734432633; bh=/K+6iQ97D4aQYEqjFaog8Tw1ziqaUmh+aRZ81PoOjZ4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=LOy20ZdzfROPgpdUzwqPJF8zEODhNy13gpJJ72KANC1S73M1N9If0vVQJ9Wo0xFyo Smd1p/uuUDFkUadXZXUkIukWhupXnBMt0L/CKEnmKPgnxUX0QIaQFr7cT1tz/ZQZJH sPjgJ7Rqxqg/2Ks+KVnF7HNnilLC8Y1G9yYY2Dw6liEbJ7TdprdGB/87kabdk9AFeE CVhaKRdX1a1+yyXy8ngp0OQ5lB6TgO58AzGkNPdaD7txv0Sf/dOMkRwjfjUDwYXcRv wa4MVifywzcZNOS/clCsPAmYyrmfeF1CUTo+vBeB0tgdnNJMF0QA/LaEfcOqFUxxCp lDhNcNiniv+Tw== Message-ID: <4c4d130b-3fd0-4339-a005-23472c82625a@kernel.org> Date: Tue, 17 Dec 2024 11:50:27 +0100 Precedence: bulk X-Mailing-List: arm-scmi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] firmware: arm_scmi: fix an OF node reference leak in scmi_txrx_setup() To: Dan Carpenter , Joe Hattori Cc: sudeep.holla@arm.com, cristian.marussi@arm.com, arm-scmi@vger.kernel.org References: <20241217023122.3927401-1-joe@pf.is.s.u-tokyo.ac.jp> <77ed017b-c5c9-4a41-aaf5-e0447c102260@stanley.mountain> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/12/2024 06:51, Dan Carpenter wrote: > On Tue, Dec 17, 2024 at 11:31:22AM +0900, Joe Hattori wrote: >> scmi_txrx_setup() calls scmi_chan_setup(), which increments the refcount >> of the given OF node. When the Rx channel setup fails with ENOMEM, >> scmi_chan_setup() returns the error, but does not release the OF node >> obtained in the Tx channel setup. Thus, add an of_node_put() call when >> the Rx setup fails with ENOMEM. >> >> This bug was found by an experimental static analysis tool that I am >> developing. >> > > No, the patch is wrong. > There are more patches like this without understanding the OF drop/retain reference behavior. I suggest careful review of all results of this "static analysis tool". Best regards, Krzysztof