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[23.128.96.18]) by mx.google.com with ESMTP id s19si2113501ejj.534.2021.06.10.06.45.08; Thu, 10 Jun 2021 06:45:31 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230346AbhFJNpk (ORCPT + 99 others); Thu, 10 Jun 2021 09:45:40 -0400 Received: from mga18.intel.com ([134.134.136.126]:32200 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230035AbhFJNpk (ORCPT ); Thu, 10 Jun 2021 09:45:40 -0400 IronPort-SDR: ijNLcZeF5y7R0vxWcbtQByiFfwXOqClHhqD10wuZ4kHT2zIFZ/VFMI8z0POZvnad8XKpduVxOC OzXsUick2uRg== X-IronPort-AV: E=McAfee;i="6200,9189,10011"; a="192614306" X-IronPort-AV: E=Sophos;i="5.83,263,1616482800"; d="scan'208";a="192614306" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jun 2021 06:43:43 -0700 IronPort-SDR: 4bI7WwuI1VynjZB6+2+wXGmPWRIUo6/rHyQUyHGCD9k+FFESiUC4dP2CazQ60svMcdkK6gLtYi IxnKBTcpLdlg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,263,1616482800"; d="scan'208";a="448723601" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by orsmga008.jf.intel.com with ESMTP; 10 Jun 2021 06:43:40 -0700 Subject: Re: [PATCH] xhci: solve a double free problem while doing s4 To: "Zhangjiantao (Kirin, nanjing)" , "Xuetao (kirin)" , "mathias.nyman@intel.com" , "gregkh@linuxfoundation.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" Cc: "chenyu (U)" , Caiyadong , xuhaiyang References: <1623244292-108534-1-git-send-email-xuetao09@huawei.com> <1428e2d7b7b74fccb3493384f96c521a@huawei.com> From: Mathias Nyman Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <1428e2d7b7b74fccb3493384f96c521a@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9.6.2021 17.22, Zhangjiantao (Kirin, nanjing) wrote: > when system is doing s4, the process of xhci_resume may be as below: > 1、xhci_mem_cleanup > 2、xhci_init->xhci_mem_init->xhci_mem_cleanup(when memory is not enough). > xhci_mem_cleanup will be executed twice when system is out of memory. > xhci->port_caps is freed in xhci_mem_cleanup,but it isn't set to NULL. > It will be freed twice when xhci_mem_cleanup is called the second time. > Thanks, nice catch > We got following bug when system resumes from s4: > > kernel BUG at mm/slub.c:309! > Internal error: Oops - BUG: 0 [#1] PREEMPT SMP > CPU: 0 PID: 5929 Tainted: G S W 5.4.96-arm64-desktop #1 > pc : __slab_free+0x5c/0x424 > lr : kfree+0x30c/0x32c > > Call trace: > __slab_free+0x5c/0x424 > kfree+0x30c/0x32c > xhci_mem_cleanup+0x394/0x3cc > xhci_mem_init+0x9ac/0x1070 > xhci_init+0x8c/0x1d0 > xhci_resume+0x1cc/0x5fc > xhci_plat_resume+0x64/0x70 > platform_pm_thaw+0x28/0x60 > dpm_run_callback+0x54/0x24c > device_resume+0xd0/0x200 > async_resume+0x24/0x60 > async_run_entry_fn+0x44/0x110 > process_one_work+0x1f0/0x490 > worker_thread+0x5c/0x450 > kthread+0x158/0x160 > ret_from_fork+0x10/0x24 > > Signed-off-by: Tao Xue Checkpatch complains: ERROR: Missing Signed-off-by: line by nominal patch author 'Zhangjiantao (Kirin, nanjing) ' Is Zhangjiantao (Kirin, nanjing) the correct author? If yes can I add "Signed-off-by: Zhangjiantao (Kirin, nanjing) ? I'll add the stable and correct fixes tags for this. Thanks Mathias