From patchwork Mon May 4 16:59:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tamizh chelvam X-Patchwork-Id: 11526757 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 820D5912 for ; Mon, 4 May 2020 17:01:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 646B4206D9 for ; Mon, 4 May 2020 17:01:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="EvfJ1UjV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729884AbgEDRBh (ORCPT ); Mon, 4 May 2020 13:01:37 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:30965 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729459AbgEDRBh (ORCPT ); Mon, 4 May 2020 13:01:37 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588611696; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=fPoux2pQjdP+ZEXNV24YVedAMDvry0ZQnYEZA4UjdyY=; b=EvfJ1UjVQmbHJ8b0csB78Qa4UNBAvMXt8flihFiYcdkO7v1xjlfdE32yHxHcDK0Zm+CAVMll qTZlDgVxh6Dx91SeqLEurdinlMA1uRagNYNspmhYGIUQ7Yw/NwfPaZaegIEHWHlF3nd43JGL r13Pv7dMa1yp7gk/KutWlyjKMJk= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI3YTAwOSIsICJsaW51eC13aXJlbGVzc0B2Z2VyLmtlcm5lbC5vcmciLCAiYmU5ZTRhIl0= Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5eb04a57.7ff0eb95a110-smtp-out-n03; Mon, 04 May 2020 17:01:11 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 9BDA3C433BA; Mon, 4 May 2020 17:01:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from cheath10p342229-lin.qca.qualcomm.com (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tamizhr) by smtp.codeaurora.org (Postfix) with ESMTPSA id 0365FC433CB; Mon, 4 May 2020 17:01:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0365FC433CB Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=tamizhr@codeaurora.org From: Tamizh Chelvam To: ath11k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, Tamizh Chelvam Subject: [PATCH] ath11k: fix kernel panic by freeing the msdu received with invalid length Date: Mon, 4 May 2020 22:29:28 +0530 Message-Id: <1588611568-20791-1-git-send-email-tamizhr@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In certain scenario host receives the packets with invalid length which causes below kernel panic. Free up those msdus to avoid this kernel panic. 2270.028121: <6> task: ffffffc0008306d0 ti: ffffffc0008306d0 task.ti: ffffffc0008306d0 2270.035247: <2> PC is at skb_panic+0x40/0x44 2270.042784: <2> LR is at skb_panic+0x40/0x44 2270.521775: <2> [] skb_panic+0x40/0x44 2270.524039: <2> [] skb_put+0x54/0x5c 2270.529264: <2> [] ath11k_dp_process_rx_err+0x320/0x5b0 [ath11k] 2270.533860: <2> [] ath11k_dp_service_srng+0x80/0x268 [ath11k] 2270.541063: <2> [] ath11k_hal_rx_reo_ent_buf_paddr_get+0x200/0xb64 [ath11k] 2270.547917: <2> [] net_rx_action+0xf8/0x274 2270.556247: <2> [] __do_softirq+0x128/0x228 2270.561625: <2> [] irq_exit+0x84/0xcc 2270.567008: <2> [] __handle_domain_irq+0x8c/0xb0 2270.571695: <2> [] gic_handle_irq+0x6c/0xbc Signed-off-by: Tamizh Chelvam --- drivers/net/wireless/ath/ath11k/dp_rx.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index 47ad3bd..90d2d47 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -2270,6 +2270,7 @@ static int ath11k_dp_rx_process_msdu(struct ath11k *ar, struct ieee80211_hdr *hdr; struct sk_buff *last_buf; u8 l3_pad_bytes; + u8 *hdr_status; u16 msdu_len; int ret; @@ -2298,8 +2299,13 @@ static int ath11k_dp_rx_process_msdu(struct ath11k *ar, skb_pull(msdu, HAL_RX_DESC_SIZE); } else if (!rxcb->is_continuation) { if ((msdu_len + HAL_RX_DESC_SIZE) > DP_RX_BUFFER_SIZE) { + hdr_status = ath11k_dp_rx_h_80211_hdr(rx_desc); ret = -EINVAL; ath11k_warn(ar->ab, "invalid msdu len %u\n", msdu_len); + ath11k_dbg_dump(ar->ab, ATH11K_DBG_DATA, NULL, "", hdr_status, + sizeof(struct ieee80211_hdr)); + ath11k_dbg_dump(ar->ab, ATH11K_DBG_DATA, NULL, "", rx_desc, + sizeof(struct hal_rx_desc)); goto free_out; } skb_put(msdu, HAL_RX_DESC_SIZE + l3_pad_bytes + msdu_len); @@ -3394,6 +3400,7 @@ static int ath11k_dp_rx_frag_h_mpdu(struct ath11k *ar, struct sk_buff *msdu; struct ath11k_skb_rxcb *rxcb; struct hal_rx_desc *rx_desc; + u8 *hdr_status; u16 msdu_len; spin_lock_bh(&rx_ring->idr_lock); @@ -3431,6 +3438,17 @@ static int ath11k_dp_rx_frag_h_mpdu(struct ath11k *ar, rx_desc = (struct hal_rx_desc *)msdu->data; msdu_len = ath11k_dp_rx_h_msdu_start_msdu_len(rx_desc); + if ((msdu_len + HAL_RX_DESC_SIZE) > DP_RX_BUFFER_SIZE) { + hdr_status = ath11k_dp_rx_h_80211_hdr(rx_desc); + ath11k_warn(ar->ab, "invalid msdu leng %u", msdu_len); + ath11k_dbg_dump(ar->ab, ATH11K_DBG_DATA, NULL, "", hdr_status, + sizeof(struct ieee80211_hdr)); + ath11k_dbg_dump(ar->ab, ATH11K_DBG_DATA, NULL, "", rx_desc, + sizeof(struct hal_rx_desc)); + dev_kfree_skb_any(msdu); + goto exit; + } + skb_put(msdu, HAL_RX_DESC_SIZE + msdu_len); if (ath11k_dp_rx_frag_h_mpdu(ar, msdu, ring_desc)) {