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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A6925C531D0 for ; Mon, 27 Jul 2026 16:28:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:content-type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5c5LHNMDyrfpbCL+oP67Kl7Zt1ZSK6M0DXqAXGnTsGs=; b=q45p8y6j/EsSTpkSGT0J8uGslp y1u6Iz9ia4dxD4RR+V6fhovV7p330tHLZwFecdaMEtJlrADfn4gBcvfPUEY44BvYH6tEL7ZxBvbVM 7i0bTV0RqginbVkc8UCvufgNYPAZL2qIpEvol3oduoif9Do2Mxq4ByGPu+OPpBjuDXDWJlVJgF3xB mcsD5qw0eOY9mMxE8iVmEdNHa6GAomXrIk7Uu53Ox7utNLmizE3LJve40LwJnmC1ej9OsuiAMnT2U wjJlvShl1QiYlHp9YBpOYeObRBj/m0yHwNchX4TXTW+Xg+3HXBqG2y1O9xNEM34WRPOn9wJ+NzJY9 LWsgZ1AQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1woOBf-00000003KDK-1Lwd; Mon, 27 Jul 2026 16:28:19 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1woOBc-00000003K9c-0JfZ for ath12k@lists.infradead.org; Mon, 27 Jul 2026 16:28:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785169695; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5c5LHNMDyrfpbCL+oP67Kl7Zt1ZSK6M0DXqAXGnTsGs=; b=Z1mt5Q96yRMLcazktXSyJUUdeExCM48DfbJ0Pps7ZOpvSADhWzC0RS+NHuP2BwZ+t3g21c +eSbQsgmdiE7xjwIfiBe71Lt3+OSljvuISz2BZqhq76GEACcnJn0qHbnRFF5taCv+gHAui +85YjrXbQpX7qaKIcP+obGMDpiEQnkU= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-53-ZL5RVDsFO5aq4w3Pe7Z7_Q-1; Mon, 27 Jul 2026 12:28:10 -0400 X-MC-Unique: ZL5RVDsFO5aq4w3Pe7Z7_Q-1 X-Mimecast-MFC-AGG-ID: ZL5RVDsFO5aq4w3Pe7Z7_Q_1785169689 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 939BC195606D; Mon, 27 Jul 2026 16:28:09 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.44.32.58]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 26858429; Mon, 27 Jul 2026 16:28:06 +0000 (UTC) From: Jose Ignacio Tornos Martinez To: jjohnson@kernel.org Cc: ath11k@lists.infradead.org, ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Jose Ignacio Tornos Martinez Subject: [PATCH 2/5] wifi: ath12k: prevent scan during firmware recovery Date: Mon, 27 Jul 2026 18:27:45 +0200 Message-ID: <20260727162748.963275-3-jtornosm@redhat.com> In-Reply-To: <20260727162748.963275-1-jtornosm@redhat.com> References: <20260727162748.963275-1-jtornosm@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 X-Mimecast-MFC-PROC-ID: t4sMQtMeZj-pbVPedMNpes-cJghG_e6xx8rmmZfym30_1785169689 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260727_092816_275014_76B9C5BC X-CRM114-Status: UNSURE ( 9.26 ) X-CRM114-Notice: Please train this message. X-BeenThere: ath12k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath12k" Errors-To: ath12k-bounces+ath12k=archiver.kernel.org@lists.infradead.org When firmware crashes while wpa_supplicant has an active connection, wpa_supplicant may immediately attempt a scan via nl80211 while the firmware is still powering on through MHI. ath12k_mac_op_hw_scan() proceeds without checking the recovery state, accessing partially initialized radio structures which leads to a NULL pointer dereference: BUG: unable to handle page fault for address: 0000000000001508 RIP: ath12k_mac_op_hw_scan+0x148/0x2b0 [ath12k] Call Trace: drv_hw_scan+0x88/0x140 [mac80211] __ieee80211_start_scan+0x2bc/0x6b0 [mac80211] nl80211_trigger_scan+0x54a/0x9f0 [cfg80211] Fix by checking ATH12K_FLAG_RECOVERY at the start of ath12k_mac_op_hw_scan() and returning -EBUSY. mac80211 will retry the scan after the recovery completes. Tested on WCN7850 with MLO (Wi-Fi 7). Signed-off-by: Jose Ignacio Tornos Martinez --- drivers/net/wireless/ath/ath12k/mac.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index f33976fc1233..924c3c21ca78 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -5707,6 +5707,9 @@ int ath12k_mac_op_hw_scan(struct ieee80211_hw *hw, lockdep_assert_wiphy(hw->wiphy); + if (test_bit(ATH12K_FLAG_RECOVERY, &ah->radio[0].ab->dev_flags)) + return -EBUSY; + chan_list = kzalloc_objs(*chan_list, hw_req->req.n_channels); if (!chan_list) return -ENOMEM; -- 2.54.0