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 AD0DB3587DE; Sat, 17 Oct 2026 17:00:58 +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=1792256459; cv=none; b=kGIDPr2081JjCiGA+NYK6CDfvVG1x4dUoDwjWqS2UF/JFCZrU6QeC4J4SMFAUbKunVRqfnDt6vP80UQU3/h97CiVRu/ZcQFKCNSQvYw2O/BaZ2noYj2qvIiHBQANpYmqRgDNFdbS3L9J33IhSMp53ZXLCxVU/9pKGNZNWxAPhs0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792256459; c=relaxed/simple; bh=hRFUwS/le+4RuYJ9+rs8NdekuKuCYCATLNvDWdmBS0s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fuoU2qZ4PuEljxygxvai7K06g990GY7ZKpD32wVlqdFRYDZlwS3SK5x6N9AyTUDEbjm6YmY2Vx1yW7MX8uW0JnLEJr2cuSWi1YB57wpglnJouW/+V3W8m0ZCUO1pRpiGGtNNiPwuYf20DDatMiOsI30oalUTKWildPpDlQziF7g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ebe+aR3t; 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="Ebe+aR3t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C15771F000C4; Sat, 17 Oct 2026 17:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792256458; bh=pPuvw7myu/lHQ2Cw9AdJ8vA9OPoljjZTgC2Ris4RjHo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ebe+aR3tUbMRH395VlvyMSI0Ua3+tc6m3cVI8LAQ9j089VYcu72q7H6FIIRo5ilV9 WbnOUni17JzGqxJ8m6Uz0+ucjumehpKuUYxVYLvngNojNKlgLwBVmk/cQ+X+O1DgM9 4Tv354bbTAPvVuypGogJ0xGgXZiY1gutY5zN5aRU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wentao Liang , Chun-Kuang Hu Subject: [PATCH 6.6 0242/1674] drm/mediatek: Fix pdev reference leak in mtk_drm_bind() Date: Sat, 17 Oct 2026 17:41:54 +0200 Message-ID: <20261017160437.342903247@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261017160431.119607952@linuxfoundation.org> References: <20261017160431.119607952@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-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wentao Liang commit 3753e34b73fcbe2a2edbe984614a008a261697ef upstream. When the device is not the mmsys master, mtk_drm_bind() returns early after taking a reference on the disp-mutex device via of_find_device_by_node(), without ever dropping it: mtk_drm_unbind() only puts mutex_dev for the master. Drop the reference before returning from the non-master path. Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195 multi mmsys support") Cc: stable@vger.kernel.org Signed-off-by: Wentao Liang Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260916174058.2088709-1-vulab@iscas.ac.cn/ Signed-off-by: Chun-Kuang Hu Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/mediatek/mtk_drm_drv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -621,8 +621,10 @@ static int mtk_drm_bind(struct device *d private->mtk_drm_bound = true; private->dev = dev; - if (!mtk_drm_get_all_drm_priv(dev)) + if (!mtk_drm_get_all_drm_priv(dev)) { + put_device(private->mutex_dev); return 0; + } drm = drm_dev_alloc(&mtk_drm_driver, dev); if (IS_ERR(drm)) {