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 1975DC4167B for ; Tue, 12 Apr 2022 07:06:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235533AbiDLHIe (ORCPT ); Tue, 12 Apr 2022 03:08:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351831AbiDLHEU (ORCPT ); Tue, 12 Apr 2022 03:04:20 -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 B9BE745AC3; Mon, 11 Apr 2022 23:47:26 -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 60EFAB81B46; Tue, 12 Apr 2022 06:47:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF9D8C385A6; Tue, 12 Apr 2022 06:47:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649746044; bh=qRuj/mfnS/iQi/FDT0ADAYKbCm1QtWc2AioP8aaz6jc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KW/4tfWOZGDc9l3vUXTCLKdNbLsNjYIKjZ6krSBDssKC3TecGid0QFzTCQnp30vGy XOJkzTOn9tpEyWhPfk3ipt3p6fcBMGHB+CzAIuiHa8kFY+P3CaEh5aatBePr8j2llk MUwp9roFiNEpnc36JvwcWn7vP+k6k46g1LucYDlQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lorenzo Bianconi , Sean Wang , Deren Wu , Felix Fietkau , Sasha Levin Subject: [PATCH 5.15 099/277] mt76: fix monitor mode crash with sdio driver Date: Tue, 12 Apr 2022 08:28:22 +0200 Message-Id: <20220412062944.906802798@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220412062942.022903016@linuxfoundation.org> References: <20220412062942.022903016@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: Deren Wu [ Upstream commit 123bc712b1de0805f9d683687e17b1ec2aba0b68 ] mt7921s driver may receive frames with fragment buffers. If there is a CTS packet received in monitor mode, the payload is 10 bytes only and need 6 bytes header padding after RXD buffer. However, only RXD in the first linear buffer, if we pull buffer size RXD-size+6 bytes with skb_pull(), that would trigger "BUG_ON(skb->len < skb->data_len)" in __skb_pull(). To avoid the nonlinear buffer issue, enlarge the RXD size from 128 to 256 to make sure all MCU operation in linear buffer. [ 52.007562] kernel BUG at include/linux/skbuff.h:2313! [ 52.007578] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 52.007987] pc : skb_pull+0x48/0x4c [ 52.008015] lr : mt7921_queue_rx_skb+0x494/0x890 [mt7921_common] [ 52.008361] Call trace: [ 52.008377] skb_pull+0x48/0x4c [ 52.008400] mt76s_net_worker+0x134/0x1b0 [mt76_sdio 35339a92c6eb7d4bbcc806a1d22f56365565135c] [ 52.008431] __mt76_worker_fn+0xe8/0x170 [mt76 ef716597d11a77150bc07e3fdd68eeb0f9b56917] [ 52.008449] kthread+0x148/0x3ac [ 52.008466] ret_from_fork+0x10/0x30 Signed-off-by: Lorenzo Bianconi Signed-off-by: Sean Wang Signed-off-by: Deren Wu Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt76.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 4d01fd85283d..6e4d69715927 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -19,7 +19,7 @@ #define MT_MCU_RING_SIZE 32 #define MT_RX_BUF_SIZE 2048 -#define MT_SKB_HEAD_LEN 128 +#define MT_SKB_HEAD_LEN 256 #define MT_MAX_NON_AQL_PKT 16 #define MT_TXQ_FREE_THR 32 -- 2.35.1