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 7694034EEE0; Fri, 21 Nov 2025 13:44:27 +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=1763732667; cv=none; b=svrqVRZphWtRceqmnyplgHlhoFLh3uEyOxmNBoGASOpa/zhwQIeHPGgAlj+L7yLZbDgkl59FupSqiwGLXsk8NmyYa3Xd2qZC2Nu4Qj2oIJpJHdDW8m4w6szxdiVqcI/bwvQ1qoQlOBBTPA8EO3VdYHZDM7xiMtbk+Bs+rHGOLQI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763732667; c=relaxed/simple; bh=1PHJpNGOO1l47yrUPwBqAgkjTCpG5Qk2zOGPwegAb8w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZjIdEwmX8oJdV8TqJXp7oMz7SinlCTNZubYWTQMDXLX/31wX1Q9OIZFc7+vZytF6U81lUBOY5IVxA+BNMHtCJLIajfsxHWmTiA3K/WQdgBwcd12qn0E6P2BA7j1mtRoiyJRzJSqWEthp/997eWOwG1DZDtkBsoNs/4PlWVrCsWg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jAjO0Gh2; 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="jAjO0Gh2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8DB2EC4CEFB; Fri, 21 Nov 2025 13:44:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1763732666; bh=1PHJpNGOO1l47yrUPwBqAgkjTCpG5Qk2zOGPwegAb8w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jAjO0Gh2/Epk0HumcQ32qm5hVn25Ud6S7fBqyH6OhefaIsorifagoTdY8Iibz4G4x ZoQefmUwEGFZOt9/Hihm5KI38P8xxcZnmrpD8K1f7FV0xcf7ZKY+CfXUV16FX5eoXF BrUeZhc0GydL/bb8bAspdBPQV8E/mFNX7hDE/CFI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chen Yufeng , Sasha Levin Subject: [PATCH 6.6 200/529] usb: cdns3: gadget: Use-after-free during failed initialization and exit of cdnsp gadget Date: Fri, 21 Nov 2025 14:08:19 +0100 Message-ID: <20251121130238.132644084@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121130230.985163914@linuxfoundation.org> References: <20251121130230.985163914@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: Chen Yufeng [ Upstream commit 87c5ff5615dc0a37167e8faf3adeeddc6f1344a3 ] In the __cdnsp_gadget_init() and cdnsp_gadget_exit() functions, the gadget structure (pdev->gadget) was freed before its endpoints. The endpoints are linked via the ep_list in the gadget structure. Freeing the gadget first leaves dangling pointers in the endpoint list. When the endpoints are subsequently freed, this results in a use-after-free. Fix: By separating the usb_del_gadget_udc() operation into distinct "del" and "put" steps, cdnsp_gadget_free_endpoints() can be executed prior to the final release of the gadget structure with usb_put_gadget(). A patch similar to bb9c74a5bd14("usb: dwc3: gadget: Free gadget structure only after freeing endpoints"). Signed-off-by: Chen Yufeng Link: https://lore.kernel.org/r/20250905094842.1232-1-chenyufeng@iie.ac.cn Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/cdns3/cdnsp-gadget.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c index 38e693cd3efc0..fb192b120d77f 100644 --- a/drivers/usb/cdns3/cdnsp-gadget.c +++ b/drivers/usb/cdns3/cdnsp-gadget.c @@ -1975,7 +1975,10 @@ static int __cdnsp_gadget_init(struct cdns *cdns) return 0; del_gadget: - usb_del_gadget_udc(&pdev->gadget); + usb_del_gadget(&pdev->gadget); + cdnsp_gadget_free_endpoints(pdev); + usb_put_gadget(&pdev->gadget); + goto halt_pdev; free_endpoints: cdnsp_gadget_free_endpoints(pdev); halt_pdev: @@ -1997,8 +2000,9 @@ static void cdnsp_gadget_exit(struct cdns *cdns) devm_free_irq(pdev->dev, cdns->dev_irq, pdev); pm_runtime_mark_last_busy(cdns->dev); pm_runtime_put_autosuspend(cdns->dev); - usb_del_gadget_udc(&pdev->gadget); + usb_del_gadget(&pdev->gadget); cdnsp_gadget_free_endpoints(pdev); + usb_put_gadget(&pdev->gadget); cdnsp_mem_cleanup(pdev); kfree(pdev); cdns->gadget_dev = NULL; -- 2.51.0