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 0EB3DC433FE for ; Sat, 22 Oct 2022 10:10:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230063AbiJVKK4 (ORCPT ); Sat, 22 Oct 2022 06:10:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230190AbiJVKKj (ORCPT ); Sat, 22 Oct 2022 06:10:39 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6BAA530F9DB; Sat, 22 Oct 2022 02:27:33 -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 ams.source.kernel.org (Postfix) with ESMTPS id 34D06B82E24; Sat, 22 Oct 2022 07:45:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B31AC433C1; Sat, 22 Oct 2022 07:45:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666424719; bh=Vozqve6uz0M1YkzgDdcf8XEiQm+jmQXPx46GgpjETVE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AtRqtR+f9jN3C1CFjU5BJFgyqBKq0PhnvIvrAjSagNaMPUiFTyg6iOPnOPJylrfaL iW7W1IbXsMU+qH+XCpZ1mfKgiqlypaDSz8cf8unxiJtfUUt+UtyjJRQFntyiB6IqbV 1C8Bwp23hOj5DZAY7/rqmNEei+G4tBbAwyT78RD8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Deren Wu , Felix Fietkau , Sasha Levin Subject: [PATCH 5.19 250/717] wifi: mt76: mt7921e: fix rmmod crash in driver reload test Date: Sat, 22 Oct 2022 09:22:09 +0200 Message-Id: <20221022072459.104520548@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221022072415.034382448@linuxfoundation.org> References: <20221022072415.034382448@linuxfoundation.org> User-Agent: quilt/0.67 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: Deren Wu [ Upstream commit b5a62d612b7baf6e09884e4de94decb6391d6a9d ] In insmod/rmmod stress test, the following crash dump shows up immediately. The problem is caused by missing mt76_dev in mt7921_pci_remove(). We should make sure the drvdata is ready before probe() finished. [168.862789] ================================================================== [168.862797] BUG: KASAN: user-memory-access in try_to_grab_pending+0x59/0x480 [168.862805] Write of size 8 at addr 0000000000006df0 by task rmmod/5361 [168.862812] CPU: 7 PID: 5361 Comm: rmmod Tainted: G OE 5.19.0-rc6 #1 [168.862816] Hardware name: Intel(R) Client Systems NUC8i7BEH/NUC8BEB, 05/04/2020 [168.862820] Call Trace: [168.862822] [168.862825] dump_stack_lvl+0x49/0x63 [168.862832] print_report.cold+0x493/0x6b7 [168.862845] kasan_report+0xa7/0x120 [168.862857] kasan_check_range+0x163/0x200 [168.862861] __kasan_check_write+0x14/0x20 [168.862866] try_to_grab_pending+0x59/0x480 [168.862870] __cancel_work_timer+0xbb/0x340 [168.862898] cancel_work_sync+0x10/0x20 [168.862902] mt7921_pci_remove+0x61/0x1c0 [mt7921e] [168.862909] pci_device_remove+0xa3/0x1d0 [168.862914] device_remove+0xc4/0x170 [168.862920] device_release_driver_internal+0x163/0x300 [168.862925] driver_detach+0xc7/0x1a0 [168.862930] bus_remove_driver+0xeb/0x2d0 [168.862935] driver_unregister+0x71/0xb0 [168.862939] pci_unregister_driver+0x30/0x230 [168.862944] mt7921_pci_driver_exit+0x10/0x1b [mt7921e] [168.862949] __x64_sys_delete_module+0x2f9/0x4b0 [168.862968] do_syscall_64+0x38/0x90 [168.862973] entry_SYSCALL_64_after_hwframe+0x63/0xcd Test steps: 1. insmode 2. do not ifup 3. rmmod quickly (within 1 second) Fixes: 1c71e03afe4b ("mt76: mt7921: move mt7921_init_hw in a dedicated work") Signed-off-by: Deren Wu Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index 295c21586273..d8347b33641e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -289,6 +289,8 @@ static int mt7921_pci_probe(struct pci_dev *pdev, goto err_free_pci_vec; } + pci_set_drvdata(pdev, mdev); + dev = container_of(mdev, struct mt7921_dev, mt76); dev->hif_ops = &mt7921_pcie_ops; -- 2.35.1