From mboxrd@z Thu Jan 1 00:00:00 1970 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 30BC5C433EF for ; Mon, 30 May 2022 14:39:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240852AbiE3OjO (ORCPT ); Mon, 30 May 2022 10:39:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237534AbiE3OVV (ORCPT ); Mon, 30 May 2022 10:21:21 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F147891572; Mon, 30 May 2022 06:50:15 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id E938ECE1027; Mon, 30 May 2022 13:50:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ED89C385B8; Mon, 30 May 2022 13:49:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1653918600; bh=w9LKfzLwAKYB46T3ecIm/GsN+H5j9J7Oa1HOgAq0IV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A+gJX+dR1Z1CkLeDn2heWqUxUir3pFn67FtLuAD0ila3HbOyhzH0F4OZNH1hD00Gq mXMLCh1uhQ9GxdMc6hvk9aYwEE+PEZESQV3RO9QlKWVR4IKwIPObkUmcYFGKaRsDNO U8ZcfpKoSKA3koTidcJUoddfjF0SWJVTDOvkLgpQxogZJMonrpgKo97r0Ujo/hhnLZ xN7iSXtmIBX3HQEAywd0HerCvLX8YCLWYPTN9M5bcnFD+04JFOmhVsjfDXIuL6f0lf O2BS4uH8BoKYxUtyIK4kay8tkOwel8R5kBKf7nTksfeV7CGzRs5VDO71nkQmyEkcbX u0Jy5+O7DsrZQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zheyu Ma , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 13/38] media: pci: cx23885: Fix the error handling in cx23885_initdev() Date: Mon, 30 May 2022 09:48:59 -0400 Message-Id: <20220530134924.1936816-13-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220530134924.1936816-1-sashal@kernel.org> References: <20220530134924.1936816-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zheyu Ma [ Upstream commit e8123311cf06d7dae71e8c5fe78e0510d20cd30b ] When the driver fails to call the dma_set_mask(), the driver will get the following splat: [ 55.853884] BUG: KASAN: use-after-free in __process_removed_driver+0x3c/0x240 [ 55.854486] Read of size 8 at addr ffff88810de60408 by task modprobe/590 [ 55.856822] Call Trace: [ 55.860327] __process_removed_driver+0x3c/0x240 [ 55.861347] bus_for_each_dev+0x102/0x160 [ 55.861681] i2c_del_driver+0x2f/0x50 This is because the driver has initialized the i2c related resources in cx23885_dev_setup() but not released them in error handling, fix this bug by modifying the error path that jumps after failing to call the dma_set_mask(). Signed-off-by: Zheyu Ma Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/pci/cx23885/cx23885-core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/media/pci/cx23885/cx23885-core.c b/drivers/media/pci/cx23885/cx23885-core.c index a1d738969d7b..06e4e1df125c 100644 --- a/drivers/media/pci/cx23885/cx23885-core.c +++ b/drivers/media/pci/cx23885/cx23885-core.c @@ -2164,7 +2164,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev, err = pci_set_dma_mask(pci_dev, 0xffffffff); if (err) { pr_err("%s/0: Oops: no 32bit PCI DMA ???\n", dev->name); - goto fail_ctrl; + goto fail_dma_set_mask; } err = request_irq(pci_dev->irq, cx23885_irq, @@ -2172,7 +2172,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev, if (err < 0) { pr_err("%s: can't get IRQ %d\n", dev->name, pci_dev->irq); - goto fail_irq; + goto fail_dma_set_mask; } switch (dev->board) { @@ -2194,7 +2194,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev, return 0; -fail_irq: +fail_dma_set_mask: cx23885_dev_unregister(dev); fail_ctrl: v4l2_ctrl_handler_free(hdl); -- 2.35.1