From patchwork Thu Nov 19 15:06:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Eckelmann X-Patchwork-Id: 328907 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=-18.7 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, URIBL_BLOCKED, 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 1ADF3C6369E for ; Thu, 19 Nov 2020 15:07:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A6CC122264 for ; Thu, 19 Nov 2020 15:07:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=narfation.org header.i=@narfation.org header.b="mA6NZSoo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728362AbgKSPHe (ORCPT ); Thu, 19 Nov 2020 10:07:34 -0500 Received: from dvalin.narfation.org ([213.160.73.56]:44604 "EHLO dvalin.narfation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726641AbgKSPHd (ORCPT ); Thu, 19 Nov 2020 10:07:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=narfation.org; s=20121; t=1605798447; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+0dfLjYEVqDVwPTXuUZ4xYNLnnj+p8sHPrmDB92QaKQ=; b=mA6NZSooYvU8g3Dn54RVEiWLxB8Okjh4B3UoSklSrmY3dOG6la9F6k+QfmeaitVbexRmpK ydDIEV7mcnqJC1J8YDr414P3Cg0f1SK8oIXAJJJerDK6HRfKIZ+5VdKqtZ9/lJjTrJgN99 aOFC/dzFvI9BklWsXiYMjBei3aM/p4A= From: Sven Eckelmann To: ath11k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, Sven Eckelmann Subject: [PATCH 2/2] ath11k: Reset ath11k_skb_cb before setting new flags Date: Thu, 19 Nov 2020 16:06:14 +0100 Message-Id: <20201119150614.216644-2-sven@narfation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201119150614.216644-1-sven@narfation.org> References: <20201119150614.216644-1-sven@narfation.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org 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 --- 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 0296ba925455..9052fdd9837f 100644 --- a/drivers/net/wireless/ath/ath11k/mac.c +++ b/drivers/net/wireless/ath/ath11k/mac.c @@ -4056,6 +4056,7 @@ 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 (info_flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {