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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 5776FC433DB for ; Mon, 28 Dec 2020 14:12:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C282207A9 for ; Mon, 28 Dec 2020 14:12:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2439803AbgL1OMJ (ORCPT ); Mon, 28 Dec 2020 09:12:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:46706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2439782AbgL1OMG (ORCPT ); Mon, 28 Dec 2020 09:12:06 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D83C7206E5; Mon, 28 Dec 2020 14:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609164685; bh=6eGZIhwszPDKtwNIuHo1dw9GczcQwikWsynXpGVXpDQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eiN+Dr8kXjYHby62ibo2u3O7qXiQRpCOb4f7t66k2+gMolIE2apdPi3YrKj6z7XIh 7VrLtPMk1xDL79+O9kIANWm0yeqcM9H3Q41mKNkvUz34BoAnYBuvmDgMqJlLuVLw+G YU8m7nOQwKtWp4VWm2ehECAR2JyzMDblsQdbYYEg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sven Eckelmann , Kalle Valo , Sasha Levin Subject: [PATCH 5.10 261/717] ath11k: Reset ath11k_skb_cb before setting new flags Date: Mon, 28 Dec 2020 13:44:19 +0100 Message-Id: <20201228125033.504498972@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@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: linux-kernel@vger.kernel.org From: Sven Eckelmann [ Upstream commit 5da7acfec5ec55aa0b69b8760f1d2116b4e2ad26 ] It was observed that the codepath for the ATH11K_SKB_HW_80211_ENCAP was used even when the IEEE80211_TX_CTRL_HW_80211_ENCAP was not enabled for a an skbuff. This became even more prominent when the QCAs wlan-open patchset for ath11k [1] was applied and a sane looking fix just caused crashes when injecting frames via a monitor interface (for example with ratechecker): [ 86.963152] Unable to handle kernel NULL pointer dereference at virtual address 00000338 [ 86.963192] pgd = ffffffc0008f0000 [ 86.971034] [00000338] *pgd=0000000051706003, *pud=0000000051706003, *pmd=0000000051707003, *pte=00e800000b000707 [ 86.984292] Internal error: Oops: 96000006 [#1] PREEMPT SMP [...] [ 87.713339] [] ieee80211_tx_status_8023+0xf8/0x220 [mac80211] [ 87.715654] [] ath11k_dp_tx_completion_handler+0x42c/0xa10 [ath11k] [ 87.722924] [] ath11k_dp_service_srng+0x70/0x3c8 [ath11k] [ 87.730831] [] 0xffffffbffca03460 [ 87.737599] [] net_rx_action+0xf8/0x288 [ 87.742462] [] __do_softirq+0xfc/0x220 [ 87.748014] [] irq_exit+0x98/0xe8 [ 87.753396] [] __handle_domain_irq+0x90/0xb8 [ 87.757999] [] gic_handle_irq+0x6c/0xc8 [ 87.763899] Exception stack(0xffffffc00081bdc0 to 0xffffffc00081bef0) Problem is that the state of ath11k_skb_cb->flags must be considered unknown and could contain anything when it is not manually initialized. So it could also contain ATH11K_SKB_HW_80211_ENCAP. And this can result in the code to assume that the ath11k_skb_cb->vif is set - even when this is not always the case for non ATH11K_SKB_HW_80211_ENCAP transmissions. Tested-on: IPQ8074 hw2.0 WLAN.HK.2.4.0.1.r1-00026-QCAHKSWPL_SILICONZ-2 [1] https://source.codeaurora.org/quic/qsdk/oss/system/feeds/wlan-open/tree/mac80211/patches?h=NHSS.QSDK.11.4.r3 (162 patches at the moment which are often not upstreamed but essential to get ath11k working) Fixes: e7f33e0c52c0 ("ath11k: add tx hw 802.11 encapsulation offloading support") Signed-off-by: Sven Eckelmann Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20201119154235.263250-2-sven@narfation.org Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/ath11k/mac.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c index 6b7f00e0086f5..af427d9051a07 100644 --- a/drivers/net/wireless/ath/ath11k/mac.c +++ b/drivers/net/wireless/ath/ath11k/mac.c @@ -4057,6 +4057,7 @@ static void ath11k_mac_op_tx(struct ieee80211_hw *hw, bool is_prb_rsp; int ret; + memset(skb_cb, 0, sizeof(*skb_cb)); skb_cb->vif = vif; if (key) { -- 2.27.0