From patchwork Tue Jul 6 14:50:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 12360651 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 171F5C07E96 for ; Tue, 6 Jul 2021 14:50:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0294461447 for ; Tue, 6 Jul 2021 14:50:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232591AbhGFOxP (ORCPT ); Tue, 6 Jul 2021 10:53:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232564AbhGFOxO (ORCPT ); Tue, 6 Jul 2021 10:53:14 -0400 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE9AFC0617AB; Tue, 6 Jul 2021 07:50:34 -0700 (PDT) Received: by mail-lf1-x131.google.com with SMTP id v14so13204186lfb.4; Tue, 06 Jul 2021 07:50:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=SwvFBRtYb9/G826Ka+AfHVChgd2wyc3iTfftqZfpyDc=; b=mHwEnudSs0YuOe4477jeMklBqG8VxU3U27qu+qTT/Rvl2iKaz5Tx0P1bfRhIXWiMco DymN6c1TBnoT199gao35Ku8N8UNJY+hu8muPi9x6+uOXhT2viTXPwDJ2sJ3JRYus19ha ddDTvQRL13sHPOFAX2G/W4Eqzp/mcMxpP5DENR/uMH9chjcAEDbFHQwnxnwJNQ0YPsEX ypVZunz8q0A9pWULeeoGuDkq+4rgUz4ctERUQWP4kujSP61nMMIYA1mVgVezKiemIPAU U9EMAbPliZp+aGm9FYGesFx7mqgy0wwyIq9btglXVxzNVv3ZkqTIQLPdmDAu0kfUJcDs wQCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=SwvFBRtYb9/G826Ka+AfHVChgd2wyc3iTfftqZfpyDc=; b=TRGgiMmrOA1sP8ulMa0DHs26mjBGlwCye92S2dy9NqCyNKGu9raa+v6MrNsE6msiTx 6TAMJTETQXviwN1F5F1JiSALCaDRQau6ABzKes5P8L0XBOTMfQKP/FQHaZelnJQoNmN9 sWYjW9aFKjksQEZGAJGL9Vvs7QS4blTzyf2FzQzyqZslnJO9IUb/c5BorIgZpHYhPL/M pCiYIiL1LlFgAEGB7vn9oC6w2sG+U59sZPTBBglCSPXci+bLnMP5bPecgGDsvjcD8PBP VQTLdjf4jwtz5YFWHwqNRxCyCk6eSTZvP/wEtDMWbfw+AG3nQfQF8mMfsJpcwaGgyg8D /Kcg== X-Gm-Message-State: AOAM5306qjXLO6HZ8UNDPk8QxPkOYdMloIA9VC8xWPWrLFazvEiQQa5X 6h8aSQd1tfgQw7Fj/+4IC8kstdqJ+e3vLQ== X-Google-Smtp-Source: ABdhPJxAoXwLAsSI4g3LBzTXL0kvHp/LjRpZBpc/VVCmCeE2tRsgJSK3oPmWPh6wQollnwDYknjYcw== X-Received: by 2002:a19:6e43:: with SMTP id q3mr14946280lfk.265.1625583033035; Tue, 06 Jul 2021 07:50:33 -0700 (PDT) Received: from localhost.localdomain ([94.103.225.155]) by smtp.gmail.com with ESMTPSA id a15sm921337ljn.26.2021.07.06.07.50.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jul 2021 07:50:32 -0700 (PDT) From: Pavel Skripkin To: mchehab@kernel.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+a6969ef522a36d3344c9@syzkaller.appspotmail.com Subject: [PATCH] media: em28xx: fix corrupted list Date: Tue, 6 Jul 2021 17:50:25 +0300 Message-Id: <20210706145025.25776-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Syzbot reported corrupted list in em28xx driver. The problem was in non-reinitialized lists on disconnect. Since all 2 lists are global variables and driver can be connected and disconnected many times we should call INIT_LIST_HEAD() in .disconnect method to prevent corrupted list entries. Fixes: 1a23f81b7dc3 ("V4L/DVB (9979): em28xx: move usb probe code to a proper place") Reported-by: syzbot+a6969ef522a36d3344c9@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin --- drivers/media/usb/em28xx/em28xx-cards.c | 2 ++ drivers/media/usb/em28xx/em28xx-core.c | 6 ++++++ drivers/media/usb/em28xx/em28xx.h | 1 + 3 files changed, 9 insertions(+) diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index ba9292e2a587..8b1ff79c37a0 100644 --- a/drivers/media/usb/em28xx/em28xx-cards.c +++ b/drivers/media/usb/em28xx/em28xx-cards.c @@ -4148,6 +4148,8 @@ static void em28xx_usb_disconnect(struct usb_interface *intf) dev->dev_next = NULL; } kref_put(&dev->ref, em28xx_free_device); + + em28xx_reset_lists(); } static int em28xx_usb_suspend(struct usb_interface *intf, diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index 584fa400cd7d..03970ed00dba 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -1131,6 +1131,12 @@ void em28xx_init_extension(struct em28xx *dev) mutex_unlock(&em28xx_devlist_mutex); } +void em28xx_reset_lists(void) +{ + INIT_LIST_HEAD(&em28xx_devlist); + INIT_LIST_HEAD(&em28xx_extension_devlist); +} + void em28xx_close_extension(struct em28xx *dev) { const struct em28xx_ops *ops = NULL; diff --git a/drivers/media/usb/em28xx/em28xx.h b/drivers/media/usb/em28xx/em28xx.h index ab167cd1f400..73caaaa398d3 100644 --- a/drivers/media/usb/em28xx/em28xx.h +++ b/drivers/media/usb/em28xx/em28xx.h @@ -835,6 +835,7 @@ void em28xx_stop_urbs(struct em28xx *dev); int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode); int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio); int em28xx_register_extension(struct em28xx_ops *dev); +void em28xx_reset_lists(void); void em28xx_unregister_extension(struct em28xx_ops *dev); void em28xx_init_extension(struct em28xx *dev); void em28xx_close_extension(struct em28xx *dev);