From patchwork Thu Sep 26 02:09:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rameshkumar Sundaram X-Patchwork-Id: 831017 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 12D3F37B for ; Thu, 26 Sep 2024 02:10:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727316606; cv=none; b=DdkRZ8t9aCSvAF7YN7FFg2WK711cTbewlEP6Bg7NNESHT/LetmPbgVOWG8Vp2QxsZUoeyjgn358kwilbKvUP6s7dU8jvoPYJHz2/8pJ8ee+HiogP/f59uq5Hov5GOX66DcylI3yealnHq6SeRu0Rsf7E6H//Ybkz03nuXDtb9ws= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727316606; c=relaxed/simple; bh=/UJSuVwWyZ5OjppHCC5/O6F6vZZuGCdSf1TabATsMFo=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=I/wKt07J1zHD8RnqUm4/v7aPTJ3fvJ4hjCPPCr9X8n+oLf8oIV6UYMBVeP9R6df/BavQVAuBw1qhGUEyGoC8CCDGDP//Y+td9+h4xFTHkbmZLL/p9KKL2g8mLKN6cB66LarZUT2By4Aqz5TlNq8jg0BjGPMrfX11uNEdvsakMmM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=paSHIjRO; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="paSHIjRO" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 48PH5LAf032281; Thu, 26 Sep 2024 02:09:58 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=kvmiGTvk2TzvPFDP2IZoSj U7EAMdUc9SlRIatcWzWLA=; b=paSHIjROiwQlRrWa2w2zBA6b3qwRqP86fzyind RBhuEyvF9edXCpuCYNceYD2x1v/D36AYTATkgrjWVzjTa0OIMtraVnFIcy+Rc3xB k2lpMpmGHfY2hiInJ3QF0y7r/+kRmAGvGCj1MW1tIw13l5hPLCZWZ0+EXUgdZxdf eQYrDaA1x9s9OhZ8WbwzfdguImh4IsCjvVTETkCAwR7fJYhKu5c7MLhjg4KZ/E9P QojMKBKZqO1/efF6qYT+R+rg2Nq1+uF38nQHmGHdZrQ5JmzyHXhXNaUrrTvX29xm toFHD/s9BZYqyA1u4l1Qh8YB/JV9N13kESfGIuGVDFTYcBSg== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 41sp7up518-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 26 Sep 2024 02:09:57 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 48Q29r0T016636 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 26 Sep 2024 02:09:54 GMT Received: from hu-ramess-blr.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 25 Sep 2024 19:09:52 -0700 From: Rameshkumar Sundaram To: CC: , Rameshkumar Sundaram Subject: [PATCH] wifi: ath12k: fix use-after-free in ath12k_dp_cc_cleanup() Date: Thu, 26 Sep 2024 07:39:31 +0530 Message-ID: <20240926020931.3424376-1-quic_ramess@quicinc.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: zsd8OrUrOWwIFE8CKJZHte7e_JiaX70Z X-Proofpoint-ORIG-GUID: zsd8OrUrOWwIFE8CKJZHte7e_JiaX70Z X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1011 bulkscore=0 mlxlogscore=872 mlxscore=0 phishscore=0 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409260012 During ath12k module removal, in ath12k_core_deinit(), ath12k_mac_destroy() un-registers ah->hw from mac80211 and frees the ah->hw as well as all the ar's in it. After this ath12k_core_soc_destroy()-> ath12k_dp_free()-> ath12k_dp_cc_cleanup() tries to access one of the freed ar's from pending skb. This is because during mac destroy, driver failed to flush few data packets, which were accessed later in ath12k_dp_cc_cleanup() and freed, but using ar from the packet led to this use-after-free. BUG: KASAN: use-after-free in ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k] Write of size 4 at addr ffff888150bd3514 by task modprobe/8926 CPU: 0 UID: 0 PID: 8926 Comm: modprobe Not tainted 6.11.0-rc2-wt-ath+ #1746 Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0067.2021.0528.1339 05/28/2021 Call Trace: dump_stack_lvl+0x7d/0xe0 print_address_description.constprop.0+0x33/0x3a0 print_report+0xb5/0x260 ? kasan_addr_to_slab+0x24/0x80 kasan_report+0xd8/0x110 ? ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k] ? ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k] kasan_check_range+0xf3/0x1a0 __kasan_check_write+0x14/0x20 ath12k_dp_cc_cleanup.part.0+0x5e2/0xd40 [ath12k] ath12k_dp_free+0x178/0x420 [ath12k] ath12k_core_stop+0x176/0x200 [ath12k] ath12k_core_deinit+0x13f/0x210 [ath12k] ath12k_pci_remove+0xad/0x1c0 [ath12k] pci_device_remove+0x9b/0x1b0 device_remove+0xbf/0x150 device_release_driver_internal+0x3c3/0x580 ? __kasan_check_read+0x11/0x20 driver_detach+0xc4/0x190 bus_remove_driver+0x130/0x2a0 driver_unregister+0x68/0x90 pci_unregister_driver+0x24/0x240 ? find_module_all+0x13e/0x1e0 ath12k_pci_exit+0x10/0x20 [ath12k] __do_sys_delete_module+0x32c/0x580 ? module_flags+0x2f0/0x2f0 ? kmem_cache_free+0xf0/0x410 ? __fput+0x56f/0xab0 ? __fput+0x56f/0xab0 ? debug_smp_processor_id+0x17/0x20 __x64_sys_delete_module+0x4f/0x70 x64_sys_call+0x522/0x9f0 do_syscall_64+0x64/0x130 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f8182c6ac8b Commit 24de1b7b231c ("wifi: ath12k: fix flush failure in recovery scenarios") added the change to decrement the pending packets count in case of recovery which make sense as ah->hw as well all ar's in it are intact during recovery, but during core deinit there is no use in decrementing packets count or waking up the empty waitq as the module is going to be removed also ar from pending skbs can't be used and the packets should just be released back. To fix this, add additional vif check before trying to use the ar from skb->cb, because during core_deinit mac80211 will delete all the vifs and ath12k will remove these vif's reference (ath12k_mac_vif_unref()) from pending packets. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00214-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Fixes: 24de1b7b231c ("wifi: ath12k: fix flush failure in recovery scenarios") Signed-off-by: Rameshkumar Sundaram --- drivers/net/wireless/ath/ath12k/dp.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) base-commit: d35bb26e150d7fb7434959fad9fcaeaac99906e6 diff --git a/drivers/net/wireless/ath/ath12k/dp.c b/drivers/net/wireless/ath/ath12k/dp.c index 61aa78d8bd8c..09363ca15701 100644 --- a/drivers/net/wireless/ath/ath12k/dp.c +++ b/drivers/net/wireless/ath/ath12k/dp.c @@ -1203,9 +1203,14 @@ static void ath12k_dp_cc_cleanup(struct ath12k_base *ab) continue; skb_cb = ATH12K_SKB_CB(skb); - ar = skb_cb->ar; - if (atomic_dec_and_test(&ar->dp.num_tx_pending)) - wake_up(&ar->dp.tx_empty_waitq); + /* skb_cb's ar is valid only if the skb is associated with + * a valid vif. + */ + if (skb_cb->vif) { + ar = skb_cb->ar; + if (atomic_dec_and_test(&ar->dp.num_tx_pending)) + wake_up(&ar->dp.tx_empty_waitq); + } dma_unmap_single(ab->dev, ATH12K_SKB_CB(skb)->paddr, skb->len, DMA_TO_DEVICE);