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 D3902C433F5 for ; Tue, 5 Apr 2022 08:04:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232850AbiDEIGD (ORCPT ); Tue, 5 Apr 2022 04:06:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235491AbiDEH7r (ORCPT ); Tue, 5 Apr 2022 03:59:47 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 867B362A26; Tue, 5 Apr 2022 00:54:45 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 22F3A614F9; Tue, 5 Apr 2022 07:54:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30760C340EE; Tue, 5 Apr 2022 07:54:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649145284; bh=EP+trxRMqCa49C7lsnG5DgO4UCe6fjvRQibVs25nJNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fBldcABNtLWm1sUbAP9GoCC693oK2EsKetSF9yRTCfOHY/PYba/mCtucJs3UZGQ75 OaZTu5qsS7olTuPl52GKay+RIi+5VwQureykgGztVgc7mT2/HQDeYcflHim84W9U+C 7t5kUTJYB0r3oV0vlpTrn0bSfLG0I98lTL2o8vjM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzkaller , Dongliang Mu , Hans Verkuil , Sasha Levin Subject: [PATCH 5.17 0352/1126] media: em28xx: initialize refcount before kref_get Date: Tue, 5 Apr 2022 09:18:19 +0200 Message-Id: <20220405070417.961414853@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070407.513532867@linuxfoundation.org> References: <20220405070407.513532867@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dongliang Mu [ Upstream commit c08eadca1bdfa099e20a32f8fa4b52b2f672236d ] The commit 47677e51e2a4("[media] em28xx: Only deallocate struct em28xx after finishing all extensions") adds kref_get to many init functions (e.g., em28xx_audio_init). However, kref_init is called too late in em28xx_usb_probe, since em28xx_init_dev before will invoke those init functions and call kref_get function. Then refcount bug occurs in my local syzkaller instance. Fix it by moving kref_init before em28xx_init_dev. This issue occurs not only in dev but also dev->dev_next. Fixes: 47677e51e2a4 ("[media] em28xx: Only deallocate struct em28xx after finishing all extensions") Reported-by: syzkaller Signed-off-by: Dongliang Mu Signed-off-by: Hans Verkuil Signed-off-by: Sasha Levin --- drivers/media/usb/em28xx/em28xx-cards.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index b451ce3cb169..f3b56c065ee1 100644 --- a/drivers/media/usb/em28xx/em28xx-cards.c +++ b/drivers/media/usb/em28xx/em28xx-cards.c @@ -3936,6 +3936,8 @@ static int em28xx_usb_probe(struct usb_interface *intf, goto err_free; } + kref_init(&dev->ref); + dev->devno = nr; dev->model = id->driver_info; dev->alt = -1; @@ -4036,6 +4038,8 @@ static int em28xx_usb_probe(struct usb_interface *intf, } if (dev->board.has_dual_ts && em28xx_duplicate_dev(dev) == 0) { + kref_init(&dev->dev_next->ref); + dev->dev_next->ts = SECONDARY_TS; dev->dev_next->alt = -1; dev->dev_next->is_audio_only = has_vendor_audio && @@ -4090,12 +4094,8 @@ static int em28xx_usb_probe(struct usb_interface *intf, em28xx_write_reg(dev, 0x0b, 0x82); mdelay(100); } - - kref_init(&dev->dev_next->ref); } - kref_init(&dev->ref); - request_modules(dev); /* -- 2.34.1