From patchwork Fri Apr 2 12:26:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12180823 X-Patchwork-Delegate: kuba@kernel.org 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 0F2E2C433B4 for ; Fri, 2 Apr 2021 12:27:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D942961159 for ; Fri, 2 Apr 2021 12:27:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235341AbhDBM1g (ORCPT ); Fri, 2 Apr 2021 08:27:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:49360 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229599AbhDBM1f (ORCPT ); Fri, 2 Apr 2021 08:27:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 184BD61158; Fri, 2 Apr 2021 12:27:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617366454; bh=idDTKzoCPAbQsNqWyYOiujZSln6yo9RWoeQ82hvVNpc=; h=From:To:Cc:Subject:Date:From; b=CBRsc9Z626kNMmpXAaBUyLCFT0F4HMn9KGxh227eSJ8a8vkGHhlND13KW25wlkQkq tqFoLpK+sxXY1RcFp8rAamn7AtLWa6fNBRq4Ldbnka4dMgqpbC+EYvVs/zBB404mG4 qITvYaBkUD0UoPgXX07cB735PxuxVIhJVHWHjiZVtLANagQGepcCCcz9+xQiRnxBE1 ErmRSqCugMv5nf+zdu3WoGbUU2K+QxbqgV4ac1mRwnz6qto0BxSQ/edHP7nha1II7i iYNP0VEpAq2YW7q0C8/2+7B9ljMzkfqxVbSEd++qE8x1ro0r3m+AkPfqppOJ/pUYKe xA3uH1qHMR2CA== Received: by pali.im (Postfix) id 5000A810; Fri, 2 Apr 2021 14:27:31 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Kalle Valo Cc: "David S. Miller" , Jakub Kicinski , ath9k-devel@qca.qualcomm.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ath9k: Fix kernel NULL pointer dereference during ath_reset_internal() Date: Fri, 2 Apr 2021 14:26:53 +0200 Message-Id: <20210402122653.24014-1-pali@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Function ath9k_hw_reset() is dereferencing chan structure pointer, so it needs to be non-NULL pointer. Function ath9k_stop() already contains code which sets ah->curchan to valid non-NULL pointer prior calling ath9k_hw_reset() function. Add same code pattern also into ath_reset_internal() function to prevent kernel NULL pointer dereference in ath9k_hw_reset() function. This change fixes kernel NULL pointer dereference in ath9k_hw_reset() which is caused by calling ath9k_hw_reset() from ath_reset_internal() with NULL chan structure. [ 45.334305] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 [ 45.344417] Mem abort info: [ 45.347301] ESR = 0x96000005 [ 45.350448] EC = 0x25: DABT (current EL), IL = 32 bits [ 45.356166] SET = 0, FnV = 0 [ 45.359350] EA = 0, S1PTW = 0 [ 45.362596] Data abort info: [ 45.365756] ISV = 0, ISS = 0x00000005 [ 45.369735] CM = 0, WnR = 0 [ 45.372814] user pgtable: 4k pages, 39-bit VAs, pgdp=000000000685d000 [ 45.379663] [0000000000000008] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [ 45.388856] Internal error: Oops: 96000005 [#1] SMP [ 45.393897] Modules linked in: ath9k ath9k_common ath9k_hw [ 45.399574] CPU: 1 PID: 309 Comm: kworker/u4:2 Not tainted 5.12.0-rc2-dirty #785 [ 45.414746] Workqueue: phy0 ath_reset_work [ath9k] [ 45.419713] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--) [ 45.425910] pc : ath9k_hw_reset+0xc4/0x1c48 [ath9k_hw] [ 45.431234] lr : ath9k_hw_reset+0xc0/0x1c48 [ath9k_hw] [ 45.436548] sp : ffffffc0118dbca0 [ 45.439961] x29: ffffffc0118dbca0 x28: 0000000000000000 [ 45.445442] x27: ffffff800dee4080 x26: 0000000000000000 [ 45.450923] x25: ffffff800df9b9d8 x24: 0000000000000000 [ 45.456404] x23: ffffffc0115f6000 x22: ffffffc008d0d408 [ 45.461885] x21: ffffff800dee5080 x20: ffffff800df9b9d8 [ 45.467366] x19: 0000000000000000 x18: 0000000000000000 [ 45.472846] x17: 0000000000000000 x16: 0000000000000000 [ 45.478326] x15: 0000000000000010 x14: ffffffffffffffff [ 45.483807] x13: ffffffc0918db94f x12: ffffffc011498720 [ 45.489289] x11: 0000000000000003 x10: ffffffc0114806e0 [ 45.494770] x9 : ffffffc01014b2ec x8 : 0000000000017fe8 [ 45.500251] x7 : c0000000ffffefff x6 : 0000000000000001 [ 45.505733] x5 : 0000000000000000 x4 : 0000000000000000 [ 45.511213] x3 : 0000000000000000 x2 : ffffff801fece870 [ 45.516693] x1 : ffffffc00eded000 x0 : 000000000000003f [ 45.522174] Call trace: [ 45.524695] ath9k_hw_reset+0xc4/0x1c48 [ath9k_hw] [ 45.529653] ath_reset_internal+0x1a8/0x2b8 [ath9k] [ 45.534696] ath_reset_work+0x2c/0x40 [ath9k] [ 45.539198] process_one_work+0x210/0x480 [ 45.543339] worker_thread+0x5c/0x510 [ 45.547115] kthread+0x12c/0x130 [ 45.550445] ret_from_fork+0x10/0x1c [ 45.554138] Code: 910922c2 9117e021 95ff0398 b4000294 (b9400a61) [ 45.560430] ---[ end trace 566410ba90b50e8b ]--- [ 45.565193] Kernel panic - not syncing: Oops: Fatal exception in interrupt [ 45.572282] SMP: stopping secondary CPUs [ 45.576331] Kernel Offset: disabled [ 45.579924] CPU features: 0x00040002,0000200c [ 45.584416] Memory Limit: none [ 45.587564] Rebooting in 3 seconds.. Signed-off-by: Pali Rohár Cc: stable@vger.kernel.org --- drivers/net/wireless/ath/ath9k/main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 45f6402478b5..97c3a53f9cef 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -307,6 +307,11 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan) hchan = ah->curchan; } + if (!hchan) { + fastcc = false; + hchan = ath9k_cmn_get_channel(sc->hw, ah, &sc->cur_chan->chandef); + } + if (!ath_prepare_reset(sc)) fastcc = false;