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 3B9D53093CB for ; Mon, 5 Jan 2026 15:10:40 +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=1767625841; cv=none; b=Kldpjn7BRb37wxPMhWdq8ZV0vydp2Z6Lkai7uGdXK6k6cBOIRulD/FZoRMLYbKCv9Whun2caPjYRbRh+6POVb6qW+szwMrmDj9YIPuaWuLjJiZn1RHbrQpiUFgy1lbimdmyhHnJ3LuD+jfvsGzx+olAE68TVOrigkOlsvpj8vu0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767625841; c=relaxed/simple; bh=gAM/FGIj8VpBhknBnC4tjr82Uivszjuw+2g9uiCHm5I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bUVCVKKNnzc8SQP1wKmQdJKooDCP3p5yw5o/n0RLXIBYaJ72qyho2UHdd7fdNt7rZ53LDgSviZxTgbGiY6jPZCnin7Uzkix6WJ+DxlQkBE+3gjC8QRsXF3l+BZ3GGU6fzQ8npyxOWGMzqaFoUfM3Aqqb4wTIaZNGTPrb06OCtsQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oiD1HzHH; 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="oiD1HzHH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A6D6C19425; Mon, 5 Jan 2026 15:10:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767625840; bh=gAM/FGIj8VpBhknBnC4tjr82Uivszjuw+2g9uiCHm5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oiD1HzHHEMtmPliDl3PmrDumZXVbHFW3LMvYZmsZYMPprVMB8ngu+6Kqy/FY5/aYE kQWePbHPVu2Ml/PWk8QQ5e295hW8evoGEdo+fpa8plE7nhpyTWZZ1eF12S8RX8oT40 3r6OewReKaTzzA5SOgudt1I0gn+85V4vegSKSR4xE70vhRAYbT0g533Z11o5ebLL6x AMm8TdQgeQXAyzrmbZ8C9nCclrnpuRsHf6CxyNer+KLYDk4HknPUIqSypmnV4Wvb6+ 5EhMZDA7NJHjIZMjQM82bb3aK98PLMOm6+j9q8sOVjxPqy/VbVsXzWJ62VtQm3Ns0s hPdbSr23vuTmA== From: Sasha Levin To: stable@vger.kernel.org Cc: Johan Hovold , Olivier Moysan , olivier moysan , Mark Brown , Sasha Levin Subject: [PATCH 5.15.y 6/6] ASoC: stm32: sai: fix OF node leak on probe Date: Mon, 5 Jan 2026 10:10:33 -0500 Message-ID: <20260105151034.2625317-6-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260105151034.2625317-1-sashal@kernel.org> References: <2026010551-backpedal-chatroom-a9c7@gregkh> <20260105151034.2625317-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Johan Hovold [ Upstream commit 23261f0de09427367e99f39f588e31e2856a690e ] The reference taken to the sync provider OF node when probing the platform device is currently only dropped if the set_sync() callback fails during DAI probe. Make sure to drop the reference on platform probe failures (e.g. probe deferral) and on driver unbind. This also avoids a potential use-after-free in case the DAI is ever reprobed without first rebinding the platform driver. Fixes: 5914d285f6b7 ("ASoC: stm32: sai: Add synchronization support") Fixes: d4180b4c02e7 ("ASoC: stm32: sai: fix set_sync service") Cc: Olivier Moysan Cc: stable@vger.kernel.org # 4.16: d4180b4c02e7 Signed-off-by: Johan Hovold Reviewed-by: olivier moysan Link: https://patch.msgid.link/20251124104908.15754-4-johan@kernel.org Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/stm/stm32_sai.c | 12 +++--------- sound/soc/stm/stm32_sai_sub.c | 23 ++++++++++++++++------- 2 files changed, 19 insertions(+), 16 deletions(-) diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c index df167c389b98..026321620a20 100644 --- a/sound/soc/stm/stm32_sai.c +++ b/sound/soc/stm/stm32_sai.c @@ -122,7 +122,6 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client, if (!pdev) { dev_err(&sai_client->pdev->dev, "Device not found for node %pOFn\n", np_provider); - of_node_put(np_provider); return -ENODEV; } @@ -131,21 +130,16 @@ static int stm32_sai_set_sync(struct stm32_sai_data *sai_client, if (!sai_provider) { dev_err(&sai_client->pdev->dev, "SAI sync provider data not found\n"); - ret = -EINVAL; - goto error; + return -EINVAL; } /* Configure sync client */ ret = stm32_sai_sync_conf_client(sai_client, synci); if (ret < 0) - goto error; + return ret; /* Configure sync provider */ - ret = stm32_sai_sync_conf_provider(sai_provider, synco); - -error: - of_node_put(np_provider); - return ret; + return stm32_sai_sync_conf_provider(sai_provider, synco); } static int stm32_sai_probe(struct platform_device *pdev) diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c index 6ae1c15f3439..c7930d8f9ded 100644 --- a/sound/soc/stm/stm32_sai_sub.c +++ b/sound/soc/stm/stm32_sai_sub.c @@ -1436,7 +1436,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev, dev_err(&pdev->dev, "External synchro not supported\n"); of_node_put(args.np); - return -EINVAL; + ret = -EINVAL; + goto err_put_sync_provider; } sai->sync = SAI_SYNC_EXTERNAL; @@ -1445,7 +1446,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev, (sai->synci > (SAI_GCR_SYNCIN_MAX + 1))) { dev_err(&pdev->dev, "Wrong SAI index\n"); of_node_put(args.np); - return -EINVAL; + ret = -EINVAL; + goto err_put_sync_provider; } if (of_property_match_string(args.np, "compatible", @@ -1459,7 +1461,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev, if (!sai->synco) { dev_err(&pdev->dev, "Unknown SAI sub-block\n"); of_node_put(args.np); - return -EINVAL; + ret = -EINVAL; + goto err_put_sync_provider; } } @@ -1469,13 +1472,15 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev, of_node_put(args.np); sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck"); - if (IS_ERR(sai->sai_ck)) - return dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck), - "Missing kernel clock sai_ck\n"); + if (IS_ERR(sai->sai_ck)) { + ret = dev_err_probe(&pdev->dev, PTR_ERR(sai->sai_ck), + "Missing kernel clock sai_ck\n"); + goto err_put_sync_provider; + } ret = clk_prepare(sai->pdata->pclk); if (ret < 0) - return ret; + goto err_put_sync_provider; if (STM_SAI_IS_F4(sai->pdata)) return 0; @@ -1497,6 +1502,8 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev, err_unprepare_pclk: clk_unprepare(sai->pdata->pclk); +err_put_sync_provider: + of_node_put(sai->np_sync_provider); return ret; } @@ -1567,6 +1574,7 @@ static int stm32_sai_sub_probe(struct platform_device *pdev) err_unprepare_pclk: clk_unprepare(sai->pdata->pclk); + of_node_put(sai->np_sync_provider); return ret; } @@ -1579,6 +1587,7 @@ static void stm32_sai_sub_remove(struct platform_device *pdev) snd_dmaengine_pcm_unregister(&pdev->dev); snd_soc_unregister_component(&pdev->dev); pm_runtime_disable(&pdev->dev); + of_node_put(sai->np_sync_provider); } #ifdef CONFIG_PM_SLEEP -- 2.51.0