From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 546A43B6C17; Tue, 21 Jul 2026 20:37:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784666265; cv=none; b=dbnEdT7uvpedNhKB6beI/9F9LgOyd47vpvJlunFkNoWa9JC+tCFprbVkAeZKhaW3MXv35C4nQI7UFYbQQc641m615TiB6lBpJ6lJBrzDvJp5RLEvTb7WRSR6xuSNtPxTOIUwCpzEwDvIxLgHNsoxknPt/Ofdl0f1pfjyfAj0fro= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784666265; c=relaxed/simple; bh=3eXYCeA4VUQ7CTlME1LEtyd1WpLzdtMRZLKUYMfNods=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uNWDQPWENSzKrIADrw1qhwt2Ec/aC6h/4dPI7ook5kKuxi9RWSiP61Nn/z3kM2NER6gU1UB4dFV/xBHVu91NBoGEij+n2EdzWG1oKKVAShGq92XKMvFzMN4ZnM42AO7b8PzQbGEtwFG9E/19feya5HqT9aiC2i/ZLHjMZDU3v+Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mdKoQFm/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="mdKoQFm/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8B2D1F000E9; Tue, 21 Jul 2026 20:37:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784666264; bh=Z5159ckV9OrYwsJnpsilTpg43qi9gG9Fs/UV9BZqegQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mdKoQFm/ayUMd9wuRCwWejQRnvqxiOtyv/Bac7VC9FcoNhj2ldIpVBb70U/lxxAaX N8nmLZFGPwI4C0ooaJGRwZO8K5l2LQWXSPRxFTuK3Tw4vjgznNRbRopCeAHat9jcPg GaFjGIzzXQMGTNrCM9qEgUF2NZVBi98B+SIvBCNY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sergey Senozhatsky , Tzung-Bi Shih , Jassi Brar , Sasha Levin Subject: [PATCH 6.6 0617/1266] mailbox: mtk-adsp: fix UAF during device teardown Date: Tue, 21 Jul 2026 17:17:34 +0200 Message-ID: <20260721152455.667816625@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sergey Senozhatsky [ Upstream commit b57d1a40bc43258372fa1f4d39305e093947a262 ] When the SOF audio driver fails to initialize (e.g. firmware boot timeout), its devres unwind frees the snd_sof_dev object that the mailbox client (mtk-adsp-ipc) reaches via chan->cl->rx_callback. The mtk-adsp-mailbox shutdown clears the mailbox command registers but leaves the IRQ line unmasked, so a late interrupt can still queue a threaded handler after mbox_free_channel() had cleared chan->cl, and mbox_chan_received_data() would then trigger UAF: BUG: KASAN: slab-use-after-free in sof_ipc3_validate_fw_version sof_ipc3_validate_fw_version sof_ipc3_do_rx_work sof_ipc3_rx_msg mt8196_dsp_handle_request mtk_adsp_ipc_recv mbox_chan_received_data mtk_adsp_mbox_isr irq_thread_fn Freed by task ...: kfree devres_release_all really_probe ... (sof-audio-of-mt8196 probe failure) The crash was observed roughly three seconds after the failed probe. disable_irq() in shutdown and enable_irq() in startup. disable_irq() also waits for any in-flight interrupts, so by the time mbox_free_channel() proceeds to clear chan->cl no rx_callback can run. In addition, request the IRQ with IRQF_NO_AUTOEN so it stays masked between probe and the first client bind — otherwise an early interrupt can crash on chan->cl == NULL in mbox_chan_received_data(). Fixes: af2dfa96c52d ("mailbox: mediatek: add support for adsp mailbox controller") Signed-off-by: Sergey Senozhatsky Reviewed-by: Tzung-Bi Shih Signed-off-by: Jassi Brar Signed-off-by: Sasha Levin --- drivers/mailbox/mtk-adsp-mailbox.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/mailbox/mtk-adsp-mailbox.c b/drivers/mailbox/mtk-adsp-mailbox.c index 91487aa4d7da08..8bcecddee0eb5c 100644 --- a/drivers/mailbox/mtk-adsp-mailbox.c +++ b/drivers/mailbox/mtk-adsp-mailbox.c @@ -19,6 +19,7 @@ struct mtk_adsp_mbox_priv { struct mbox_controller mbox; void __iomem *va_mboxreg; const struct mtk_adsp_mbox_cfg *cfg; + int irq; }; struct mtk_adsp_mbox_cfg { @@ -67,6 +68,8 @@ static int mtk_adsp_mbox_startup(struct mbox_chan *chan) writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); + enable_irq(priv->irq); + return 0; } @@ -74,6 +77,8 @@ static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan) { struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox); + disable_irq(priv->irq); + /* Clear ADSP mbox command */ writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in); writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out); @@ -139,8 +144,10 @@ static int mtk_adsp_mbox_probe(struct platform_device *pdev) if (irq < 0) return irq; + priv->irq = irq; ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq, - mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE, + mtk_adsp_mbox_isr, + IRQF_TRIGGER_NONE | IRQF_NO_AUTOEN, dev_name(dev), mbox->chans); if (ret < 0) return ret; -- 2.53.0