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 03E7D27056D; Tue, 30 Sep 2025 15:23:19 +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=1759245800; cv=none; b=do6f0E7EkqTeZ/vIR5/qFPiAu3ffrjt9JZS3SDuh/Ir3YP3Bo6L6teIFP1lWGidYCmcJasYWwB1kFy9w4+iE78cW0pVdNv0i8tVo9OiCF2iqtdu80KMZOujdD7TN3BDsLki8IJmmMQ4i6tUnexqqd5uOcupk43xbiKkrBnOeF5o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759245800; c=relaxed/simple; bh=7//x2NvAvgbljN05Ks6r4it1DpagUQppYEhj8ydA+9E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=C8A+VPvga0vR1YdWA25q6p0PcBwIyUPoCkmWsIMA7Xhe1eVsADOawSKt7CwbO53qX9VnwsQiXrvmvFVIITlgzRj04tXnesVSqPfqu2L6IC4m9/4oktp7RJ85flrnMzpW6zeK6SsPB0QRvitCACyb8tk97yVGijwRebL86ZQhwAY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kCzAy8E4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="kCzAy8E4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3BA92C4CEF0; Tue, 30 Sep 2025 15:23:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759245799; bh=7//x2NvAvgbljN05Ks6r4it1DpagUQppYEhj8ydA+9E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kCzAy8E4cUL9k+Qnxzc1qJlpsVApUZApabExgS314lSwe1qrdgiwy1ZQDt1apWmRZ vor6yx134Mxos4sUdZs++gmslqScCAR8bISw86J19NzPbO4av/TxnPNCVYYJsKvMfV eVK0S7Vx512HiJxXAP1VQKr+djkebWIIfitOgSfg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zabelin Nikita , Patrik Jakobsson , Sasha Levin Subject: [PATCH 6.6 52/91] drm/gma500: Fix null dereference in hdmi teardown Date: Tue, 30 Sep 2025 16:47:51 +0200 Message-ID: <20250930143823.350408140@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250930143821.118938523@linuxfoundation.org> References: <20250930143821.118938523@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: Zabelin Nikita [ Upstream commit 352e66900cde63f3dadb142364d3c35170bbaaff ] pci_set_drvdata sets the value of pdev->driver_data to NULL, after which the driver_data obtained from the same dev is dereferenced in oaktrail_hdmi_i2c_exit, and the i2c_dev is extracted from it. To prevent this, swap these calls. Found by Linux Verification Center (linuxtesting.org) with Svacer. Fixes: 1b082ccf5901 ("gma500: Add Oaktrail support") Signed-off-by: Zabelin Nikita Signed-off-by: Patrik Jakobsson Link: https://lore.kernel.org/r/20250918150703.2562604-1-n.zabelin@mt-integration.ru Signed-off-by: Sasha Levin --- drivers/gpu/drm/gma500/oaktrail_hdmi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/gma500/oaktrail_hdmi.c b/drivers/gpu/drm/gma500/oaktrail_hdmi.c index ed8626c73541c..f0ae675581d9a 100644 --- a/drivers/gpu/drm/gma500/oaktrail_hdmi.c +++ b/drivers/gpu/drm/gma500/oaktrail_hdmi.c @@ -726,8 +726,8 @@ void oaktrail_hdmi_teardown(struct drm_device *dev) if (hdmi_dev) { pdev = hdmi_dev->dev; - pci_set_drvdata(pdev, NULL); oaktrail_hdmi_i2c_exit(pdev); + pci_set_drvdata(pdev, NULL); iounmap(hdmi_dev->regs); kfree(hdmi_dev); pci_dev_put(pdev); -- 2.51.0