From patchwork Thu Apr 27 13:33:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Neukum X-Patchwork-Id: 13225490 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2CC98C77B61 for ; Thu, 27 Apr 2023 13:33:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243661AbjD0Nd6 (ORCPT ); Thu, 27 Apr 2023 09:33:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243373AbjD0Nd4 (ORCPT ); Thu, 27 Apr 2023 09:33:56 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43889F9; Thu, 27 Apr 2023 06:33:55 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id E51651FE17; Thu, 27 Apr 2023 13:33:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1682602433; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sSlsn2rCSqBYTsqLNFs5IVZVQwI9t4hKlG0XoLdqEbM=; b=cG8jEYqUL5wSr017j5BbELR8ltGqffADlEjIabymVtICVywJkgWtsEBYQWpQ/rrvQuKDTA GEJGd/dm3/uIihq+NwFFJFCs6NKhjfj1TiHOLcFU1KQbWJP4I/ye88GYnDqV+5boEavFr9 8OfNUrQqIOY3Nd/JsHsxAgHNfiHCg7M= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id A0B8E138F9; Thu, 27 Apr 2023 13:33:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id iBdFJcF5SmSVeQAAMHmgww (envelope-from ); Thu, 27 Apr 2023 13:33:53 +0000 From: Oliver Neukum To: wim@linux-watchdog.org, linux@roeck-us.net, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Oliver Neukum Subject: [PATCH 1/8] pwcd_usb: fix error handling in probe Date: Thu, 27 Apr 2023 15:33:43 +0200 Message-Id: <20230427133350.31064-2-oneukum@suse.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230427133350.31064-1-oneukum@suse.com> References: <20230427133350.31064-1-oneukum@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org If you support only one device, you need to roll back back your counter in all cases if probe() fails. That cannot be left to usb_pcwd_delete() because that must be called conditionally. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Oliver Neukum --- drivers/watchdog/pcwd_usb.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c index 8202f0a6b093..3a22291d633b 100644 --- a/drivers/watchdog/pcwd_usb.c +++ b/drivers/watchdog/pcwd_usb.c @@ -606,7 +606,7 @@ static int usb_pcwd_probe(struct usb_interface *interface, struct usb_endpoint_descriptor *endpoint; struct usb_pcwd_private *usb_pcwd = NULL; int pipe; - int retval = -ENOMEM; + int retval = -ENODEV; int got_fw_rev; unsigned char fw_rev_major, fw_rev_minor; char fw_ver_str[20]; @@ -615,7 +615,7 @@ static int usb_pcwd_probe(struct usb_interface *interface, cards_found++; if (cards_found > 1) { pr_err("This driver only supports 1 device\n"); - return -ENODEV; + goto error_count; } /* get the active interface descriptor */ @@ -624,11 +624,12 @@ static int usb_pcwd_probe(struct usb_interface *interface, /* check out that we have a HID device */ if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { pr_err("The device isn't a Human Interface Device\n"); - return -ENODEV; + goto error_count; } if (iface_desc->desc.bNumEndpoints < 1) - return -ENODEV; + goto error_count; + /* check out the endpoint: it has to be Interrupt & IN */ endpoint = &iface_desc->endpoint[0].desc; @@ -636,16 +637,17 @@ static int usb_pcwd_probe(struct usb_interface *interface, if (!usb_endpoint_is_int_in(endpoint)) { /* we didn't find a Interrupt endpoint with direction IN */ pr_err("Couldn't find an INTR & IN endpoint\n"); - return -ENODEV; + goto error_count; } /* get a handle to the interrupt data pipe */ pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); /* allocate memory for our device and initialize it */ + retval = -ENOMEM; usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL); if (usb_pcwd == NULL) - goto error; + goto error_count; usb_pcwd_device = usb_pcwd; @@ -661,13 +663,13 @@ static int usb_pcwd_probe(struct usb_interface *interface, GFP_KERNEL, &usb_pcwd->intr_dma); if (!usb_pcwd->intr_buffer) { pr_err("Out of memory\n"); - goto error; + goto error_delete; } /* allocate the urb's */ usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); if (!usb_pcwd->intr_urb) - goto error; + goto error_delete; /* initialise the intr urb's */ usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, @@ -680,7 +682,7 @@ static int usb_pcwd_probe(struct usb_interface *interface, if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { pr_err("Problem registering interrupt URB\n"); retval = -EIO; /* failure */ - goto error; + goto error_delete; } /* The device exists and can be communicated with */ @@ -723,7 +725,7 @@ static int usb_pcwd_probe(struct usb_interface *interface, retval = register_reboot_notifier(&usb_pcwd_notifier); if (retval != 0) { pr_err("cannot register reboot notifier (err=%d)\n", retval); - goto error; + goto error_delete; } retval = misc_register(&usb_pcwd_temperature_miscdev); @@ -752,10 +754,12 @@ static int usb_pcwd_probe(struct usb_interface *interface, misc_deregister(&usb_pcwd_temperature_miscdev); err_out_unregister_reboot: unregister_reboot_notifier(&usb_pcwd_notifier); -error: +error_delete: if (usb_pcwd) usb_pcwd_delete(usb_pcwd); usb_pcwd_device = NULL; +error_count: + cards_found--; return retval; }