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[209.132.180.67]) by mx.google.com with ESMTP id z6si8913883edx.139.2019.10.21.02.48.21; Mon, 21 Oct 2019 02:48:44 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727881AbfJUJrk (ORCPT + 99 others); Mon, 21 Oct 2019 05:47:40 -0400 Received: from mail3-relais-sop.national.inria.fr ([192.134.164.104]:60384 "EHLO mail3-relais-sop.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727110AbfJUJrj (ORCPT ); Mon, 21 Oct 2019 05:47:39 -0400 X-IronPort-AV: E=Sophos;i="5.67,323,1566856800"; d="scan'208";a="323483988" Received: from portablejulia.rsr.lip6.fr ([132.227.76.63]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Oct 2019 11:47:35 +0200 Date: Mon, 21 Oct 2019 11:47:36 +0200 (CEST) From: Julia Lawall X-X-Sender: julia@hadrien To: Suwan Kim cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, shuah@kernel.org Subject: Re: drivers/usb/usbip/vhci_tx.c:150:8-18: ERROR: reference preceded by free on line 150 (fwd) In-Reply-To: <20191021094342.GA2471@localhost.localdomain> Message-ID: References: <20191021094342.GA2471@localhost.localdomain> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 21 Oct 2019, Suwan Kim wrote: > On Sat, Oct 19, 2019 at 07:49:29PM +0200, Julia Lawall wrote: > > Is it guaranteed that if usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS (line > > 123) is true on one iteration, then it will be true on all iterations? If > > not, then it could be good to set iso_buffer to NULL after the kfree on > > line 150. > > > > It is not always true on all iteration because URB on each iteration > can have different type of pipe. So, I think you are right. > Thanks for reporting this. > > I think it seems better to move the declaration of > usbip_iso_packet_descriptor into the while loop. > > Could you send a patch to Shuah? Or should I send? If you could take care of ti, that would be great. Thanks. julia > > Regards > Suwan Kim > > > julia > > > > ---------- Forwarded message ---------- > > Date: Sun, 20 Oct 2019 01:40:11 +0800 > > From: kbuild test robot > > To: kbuild@lists.01.org > > Cc: Julia Lawall > > Subject: drivers/usb/usbip/vhci_tx.c:150:8-18: ERROR: reference preceded by free > > on line 150 > > > > CC: kbuild-all@lists.01.org > > CC: linux-kernel@vger.kernel.org > > CC: "Greg Kroah-Hartman" > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > head: 998d75510e373aab5644d777d3b058312d550159 > > commit: ea44d190764b4422af4d1c29eaeb9e69e353b406 usbip: Implement SG support to vhci-hcd and stub driver > > date: 7 weeks ago > > :::::: branch date: 7 hours ago > > :::::: commit date: 7 weeks ago > > > > If you fix the issue, kindly add following tag > > Reported-by: kbuild test robot > > Reported-by: Julia Lawall > > > > >> drivers/usb/usbip/vhci_tx.c:150:8-18: ERROR: reference preceded by free on line 150 > > drivers/usb/usbip/vhci_tx.c:159:7-17: ERROR: reference preceded by free on line 150 > > > > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea44d190764b4422af4d1c29eaeb9e69e353b406 > > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > git remote update linus > > git checkout ea44d190764b4422af4d1c29eaeb9e69e353b406 > > vim +150 drivers/usb/usbip/vhci_tx.c > > > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 51 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 52 static int vhci_send_cmd_submit(struct vhci_device *vdev) > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 53 { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 54 struct usbip_iso_packet_descriptor *iso_buffer = NULL; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 55 struct vhci_priv *priv = NULL; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 56 struct scatterlist *sg; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 57 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 58 struct msghdr msg; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 59 struct kvec *iov; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 60 size_t txsize; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 61 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 62 size_t total_size = 0; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 63 int iovnum; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 64 int err = -ENOMEM; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 65 int i; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 66 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 67 while ((priv = dequeue_from_priv_tx(vdev)) != NULL) { > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 68 int ret; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 69 struct urb *urb = priv->urb; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 70 struct usbip_header pdu_header; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 71 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 72 txsize = 0; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 73 memset(&pdu_header, 0, sizeof(pdu_header)); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 74 memset(&msg, 0, sizeof(msg)); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 75 memset(&iov, 0, sizeof(iov)); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 76 > > 8272d099d05f7a drivers/usb/usbip/vhci_tx.c Shuah Khan 2017-12-18 77 usbip_dbg_vhci_tx("setup txdata urb seqnum %lu\n", > > 8272d099d05f7a drivers/usb/usbip/vhci_tx.c Shuah Khan 2017-12-18 78 priv->seqnum); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 79 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 80 if (urb->num_sgs && usb_pipeout(urb->pipe)) > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 81 iovnum = 2 + urb->num_sgs; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 82 else > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 83 iovnum = 3; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 84 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 85 iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 86 if (!iov) { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 87 usbip_event_add(&vdev->ud, SDEV_EVENT_ERROR_MALLOC); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 88 return -ENOMEM; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 89 } > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 90 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 91 if (urb->num_sgs) > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 92 urb->transfer_flags |= URB_DMA_MAP_SG; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 93 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 94 /* 1. setup usbip_header */ > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 95 setup_cmd_submit_pdu(&pdu_header, urb); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 96 usbip_header_correct_endian(&pdu_header, 1); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 97 iovnum = 0; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 98 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 99 iov[iovnum].iov_base = &pdu_header; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 100 iov[iovnum].iov_len = sizeof(pdu_header); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 101 txsize += sizeof(pdu_header); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 102 iovnum++; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 103 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 104 /* 2. setup transfer buffer */ > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 105 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 106 if (urb->num_sgs && > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 107 !usb_endpoint_xfer_isoc(&urb->ep->desc)) { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 108 for_each_sg(urb->sg, sg, urb->num_sgs, i) { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 109 iov[iovnum].iov_base = sg_virt(sg); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 110 iov[iovnum].iov_len = sg->length; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 111 iovnum++; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 112 } > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 113 } else { > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 114 iov[iovnum].iov_base = urb->transfer_buffer; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 115 iov[iovnum].iov_len = > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 116 urb->transfer_buffer_length; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 117 iovnum++; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 118 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 119 txsize += urb->transfer_buffer_length; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 120 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 121 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 122 /* 3. setup iso_packet_descriptor */ > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 123 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 124 ssize_t len = 0; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 125 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 126 iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 127 if (!iso_buffer) { > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 128 usbip_event_add(&vdev->ud, > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 129 SDEV_EVENT_ERROR_MALLOC); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 130 goto err_iso_buffer; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 131 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 132 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 133 iov[iovnum].iov_base = iso_buffer; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 134 iov[iovnum].iov_len = len; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 135 iovnum++; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 136 txsize += len; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 137 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 138 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 139 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, iovnum, > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 140 txsize); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 141 if (ret != txsize) { > > 1a4b6f66285785 drivers/staging/usbip/vhci_tx.c matt mooney 2011-05-19 142 pr_err("sendmsg failed!, ret=%d for %zd\n", ret, > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 143 txsize); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 144 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 145 err = -EPIPE; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 146 goto err_tx; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 147 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 148 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 149 kfree(iov); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 @150 kfree(iso_buffer); > > b8868e45c5f895 drivers/staging/usbip/vhci_tx.c Brian G. Merrell 2009-07-21 151 usbip_dbg_vhci_tx("send txdata\n"); > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 152 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 153 total_size += txsize; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 154 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 155 > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 156 return total_size; > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 157 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 158 err_tx: > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 159 kfree(iso_buffer); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 160 err_iso_buffer: > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 161 kfree(iov); > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 162 > > ea44d190764b44 drivers/usb/usbip/vhci_tx.c Suwan Kim 2019-08-28 163 return err; > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 164 } > > 04679b3489e048 drivers/staging/usbip/vhci_tx.c Takahiro Hirofuchi 2008-07-09 165 > > > > :::::: The code at line 150 was first introduced by commit > > :::::: 04679b3489e048cd5dae79e050a3afed8e4e42b6 Staging: USB/IP: add client driver > > > > :::::: TO: Takahiro Hirofuchi > > :::::: CC: Greg Kroah-Hartman > > > > --- > > 0-DAY kernel test infrastructure Open Source Technology Center > > https://lists.01.org/pipermail/kbuild-all Intel Corporation >