From patchwork Tue Apr 11 21:23:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 13208276 X-Patchwork-Delegate: nbd@nbd.name 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 3F813C7619A for ; Tue, 11 Apr 2023 21:23:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229682AbjDKVXW (ORCPT ); Tue, 11 Apr 2023 17:23:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229585AbjDKVXV (ORCPT ); Tue, 11 Apr 2023 17:23:21 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF9FF1BE8 for ; Tue, 11 Apr 2023 14:23:19 -0700 (PDT) X-UUID: 117cc828d8af11eda9a90f0bb45854f4-20230412 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=O6xVJlFYJEMuNTibKVAvYMc8gRzK9AjQY/pazS15uUc=; b=qiGgnSb/nz+F3kbQ9NJ+JZvRNZcMFBvVFZ1Bndk0Q+9cXI21RetZz0tUX0bxiX6DAWrzYCLtAZ+Rm3mAzenaJiET18Q444c5B4tnfYTDJmc67ZqFd5gJpH0IwkYBHvA9DUZ4nF3fgEkp/dnelrFa31D6RjvZNxkd5kNLjQmfMro=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.22,REQID:411f82b0-42a9-437c-b0fa-04cefe06d032,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:70 X-CID-INFO: VERSION:1.1.22,REQID:411f82b0-42a9-437c-b0fa-04cefe06d032,IP:0,URL :0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Spam_GS981B3D,ACTI ON:quarantine,TS:70 X-CID-META: VersionHash:120426c,CLOUDID:045aa0ea-db6f-41fe-8b83-13fe7ed1ef52,B ulkID:230412052317O3M0PWKU,BulkQuantity:0,Recheck:0,SF:28|17|19|48|38|29,T C:nil,Content:0,EDM:-3,IP:nil,URL:11|1,File:nil,Bulk:nil,QS:nil,BEC:nil,CO L:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-UUID: 117cc828d8af11eda9a90f0bb45854f4-20230412 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1852530396; Wed, 12 Apr 2023 05:23:14 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.25; Wed, 12 Apr 2023 05:23:12 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.25 via Frontend Transport; Wed, 12 Apr 2023 05:23:12 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2] mt76: mt7921: fix kernel panic by accessing unallocated eeprom.data Date: Wed, 12 Apr 2023 05:23:11 +0800 Message-ID: X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Sean Wang The MT7921 driver no longer uses eeprom.data, but the relevant code has not been removed completely since commit 16d98b548365 ("mt76: mt7921: rely on mcu_get_nic_capability"). This could result in potential invalid memory access. To fix the kernel panic issue in mt7921, it is necessary to avoid accessing unallocated eeprom.data which can lead to invalid memory access. Furthermore, it is possible to entirely eliminate the mt7921_mcu_parse_eeprom function and solely depend on mt7921_mcu_parse_response to divide the RxD header. [2.702735] BUG: kernel NULL pointer dereference, address: 0000000000000550 [2.702740] #PF: supervisor write access in kernel mode [2.702741] #PF: error_code(0x0002) - not-present page [2.702743] PGD 0 P4D 0 [2.702747] Oops: 0002 [#1] PREEMPT SMP NOPTI [2.702755] RIP: 0010:mt7921_mcu_parse_response+0x147/0x170 [mt7921_common] [2.702758] RSP: 0018:ffffae7c00fef828 EFLAGS: 00010286 [2.702760] RAX: ffffa367f57be024 RBX: ffffa367cc7bf500 RCX: 0000000000000000 [2.702762] RDX: 0000000000000550 RSI: 0000000000000000 RDI: ffffa367cc7bf500 [2.702763] RBP: ffffae7c00fef840 R08: ffffa367cb167000 R09: 0000000000000005 [2.702764] R10: 0000000000000000 R11: ffffffffc04702e4 R12: ffffa367e8329f40 [2.702766] R13: 0000000000000000 R14: 0000000000000001 R15: ffffa367e8329f40 [2.702768] FS: 000079ee6cf20c40(0000) GS:ffffa36b2f940000(0000) knlGS:0000000000000000 [2.702769] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [2.702775] CR2: 0000000000000550 CR3: 00000001233c6004 CR4: 0000000000770ee0 [2.702776] PKRU: 55555554 [2.702777] Call Trace: [2.702782] mt76_mcu_skb_send_and_get_msg+0xc3/0x11e [mt76 ] [2.702785] mt7921_run_firmware+0x241/0x853 [mt7921_common ] [2.702789] mt7921e_mcu_init+0x2b/0x56 [mt7921e ] [2.702792] mt7921_register_device+0x2eb/0x5a5 [mt7921_common ] [2.702795] ? mt7921_irq_tasklet+0x1d4/0x1d4 [mt7921e ] [2.702797] mt7921_pci_probe+0x2d6/0x319 [mt7921e ] [2.702799] pci_device_probe+0x9f/0x12a Fixes: 16d98b548365 ("mt76: mt7921: rely on mcu_get_nic_capability") Signed-off-by: Sean Wang --- v2: fix the build warning caught with kernel test robot and entirely remove mt7921_mcu_parse_eeprom. --- .../net/wireless/mediatek/mt76/mt7921/mcu.c | 20 ------------------- 1 file changed, 20 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c index c5e7ad06f877..48f38dbbb91d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c @@ -16,24 +16,6 @@ static bool mt7921_disable_clc; module_param_named(disable_clc, mt7921_disable_clc, bool, 0644); MODULE_PARM_DESC(disable_clc, "disable CLC support"); -static int -mt7921_mcu_parse_eeprom(struct mt76_dev *dev, struct sk_buff *skb) -{ - struct mt7921_mcu_eeprom_info *res; - u8 *buf; - - if (!skb) - return -EINVAL; - - skb_pull(skb, sizeof(struct mt76_connac2_mcu_rxd)); - - res = (struct mt7921_mcu_eeprom_info *)skb->data; - buf = dev->eeprom.data + le32_to_cpu(res->addr); - memcpy(buf, res->data, 16); - - return 0; -} - int mt7921_mcu_parse_response(struct mt76_dev *mdev, int cmd, struct sk_buff *skb, int seq) { @@ -60,8 +42,6 @@ int mt7921_mcu_parse_response(struct mt76_dev *mdev, int cmd, } else if (cmd == MCU_EXT_CMD(THERMAL_CTRL)) { skb_pull(skb, sizeof(*rxd) + 4); ret = le32_to_cpu(*(__le32 *)skb->data); - } else if (cmd == MCU_EXT_CMD(EFUSE_ACCESS)) { - ret = mt7921_mcu_parse_eeprom(mdev, skb); } else if (cmd == MCU_UNI_CMD(DEV_INFO_UPDATE) || cmd == MCU_UNI_CMD(BSS_INFO_UPDATE) || cmd == MCU_UNI_CMD(STA_REC_UPDATE) ||