From patchwork Mon Nov 21 11:03:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikanta Pubbisetty X-Patchwork-Id: 13050613 X-Patchwork-Delegate: kvalo@adurom.com 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9378AC433FE for ; Mon, 21 Nov 2022 11:04:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229685AbiKULE2 (ORCPT ); Mon, 21 Nov 2022 06:04:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229475AbiKULE0 (ORCPT ); Mon, 21 Nov 2022 06:04:26 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CDEB22297 for ; Mon, 21 Nov 2022 03:04:26 -0800 (PST) Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2AL8SFEp017448; Mon, 21 Nov 2022 11:04:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=lKMXngEBc3eIeWXCu2Kx+xMnPjpxi8v5C4tNX3xXGO8=; b=Nfvd2D3Y5PS2yhUpTsiKW8M5h6yEwZN84bLP6I9H4dhbI09VpN7/NPzCx4e4Qi0HmQyw O9tInvcTpSvjfgcNbZ0IwE8GEf4Iinlj/Imo6w0mCp1XeoVNpWAzOLiDLNdfzb83iODM nTPmdwVhy2oCpq4FHEDTlbDAgCM3bsS2/wcoKON3WcxMrHJsCF0Q45AAtF+1Hqvw3X1A bOrV6BSpx19ebKJEd/4I4/iTwtsEVwrx6N2DeRigx0F7Vdi/ze5pFwWMi6oVf+YtgGfW rbbnjmPX+FLulqoFbdA7eabDFp+L1w0rLLDQR7Radxk7ymc3/8kLl8CHm+deQx4CvQNb Ug== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3kxraucasm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 21 Nov 2022 11:04:24 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 2ALB4Npd019423 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 21 Nov 2022 11:04:23 GMT Received: from mpubbise-linux.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 15.2.986.36; Mon, 21 Nov 2022 03:04:21 -0800 From: Manikanta Pubbisetty To: CC: , Manikanta Pubbisetty Subject: [PATCH v3 1/3] ath11k: Fix double free issue during SRNG deinit Date: Mon, 21 Nov 2022 16:33:57 +0530 Message-ID: <20221121110359.4652-2-quic_mpubbise@quicinc.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221121110359.4652-1-quic_mpubbise@quicinc.com> References: <20221121110359.4652-1-quic_mpubbise@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) 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: Bx18R4HoksXDdUuSqchQ6v16G6Jvkr0S X-Proofpoint-ORIG-GUID: Bx18R4HoksXDdUuSqchQ6v16G6Jvkr0S X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-21_06,2022-11-18_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 adultscore=0 mlxlogscore=747 priorityscore=1501 suspectscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211210087 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Currently struct ath11k_hal::srng_config pointer is not assigned to NULL after freeing the memory in ath11k_hal_srng_deinit(). This could lead to double free issue in a scenario where ath11k_hal_srng_deinit() is invoked back to back. In the current code, although the chances are very low, the above said scenario could happen when hardware recovery has failed and then there is another FW assert where ath11k_hal_srng_deinit() is invoked once again as part of recovery. Addressing this issue is important when low power mode support is enabled in the driver (will be added by a future patch) where this scenario is likely. Fix this by assigning the struct ath11k_hal::srng_config pointer to NULL after freeing the memory. Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1 Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.16 Signed-off-by: Manikanta Pubbisetty --- drivers/net/wireless/ath/ath11k/hal.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/ath/ath11k/hal.c b/drivers/net/wireless/ath/ath11k/hal.c index 2fd224480d45..e92c741526f8 100644 --- a/drivers/net/wireless/ath/ath11k/hal.c +++ b/drivers/net/wireless/ath/ath11k/hal.c @@ -1319,6 +1319,7 @@ void ath11k_hal_srng_deinit(struct ath11k_base *ab) ath11k_hal_free_cont_rdp(ab); ath11k_hal_free_cont_wrp(ab); kfree(hal->srng_config); + hal->srng_config = NULL; } EXPORT_SYMBOL(ath11k_hal_srng_deinit);