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 E5C2CC3527B for ; Fri, 1 Apr 2022 14:51:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348707AbiDAOw4 (ORCPT ); Fri, 1 Apr 2022 10:52:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350257AbiDAOrV (ORCPT ); Fri, 1 Apr 2022 10:47:21 -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 1E1D4221B9D; Fri, 1 Apr 2022 07:37:23 -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 F37F7B8240E; Fri, 1 Apr 2022 14:37:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C45F2C36AE3; Fri, 1 Apr 2022 14:37:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648823838; bh=TNhuIYcQcfG4QlNOpWtFeXYobcT5C6Y/M7tHewwSy5E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BkCMqCklg1npmmNOYdACDMrRxCxT+Du4OssYB70E69JbBqvsacJEjf5quYmix4rOd qM35wvFAMJVdWQtnA0YjyS8druLPFpTwqCcr2tL/Fs+hIXyClGz0Ll2QI2/PN1GAVT eHAC1t1SwHnKhqLtv8/mOCjwBsjJvDnqDgK8P4zKC3ga35vLTQVcu3i8PfJ7yYxFm8 oTfPZ4M3ZxteJXEYQH5JtQY9FwvPzozQkI01KFomOaSbHKu3OQBCgcMOIhEr3TgT2l FOw8pRQ3FMpICFRkoTm7DnoGmQLt2lRX9XAkwhOadDKI2hA75Wuntz9R82WibtEri8 0pNArgX7bx0wg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Deren Wu , Lorenzo Bianconi , Sean Wang , Felix Fietkau , Sasha Levin , lorenzo.bianconi83@gmail.com, ryder.lee@mediatek.com, kvalo@kernel.org, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, matthias.bgg@gmail.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH AUTOSEL 5.16 099/109] mt76: fix monitor mode crash with sdio driver Date: Fri, 1 Apr 2022 10:32:46 -0400 Message-Id: <20220401143256.1950537-99-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401143256.1950537-1-sashal@kernel.org> References: <20220401143256.1950537-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@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 e2da720a91b6..f740a8ba164d 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 -- 2.34.1