Return-Path: Received: from mail-pd0-f173.google.com ([209.85.192.173]:33173 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751685AbbCVNXJ (ORCPT ); Sun, 22 Mar 2015 09:23:09 -0400 Received: by pdnc3 with SMTP id c3so158875777pdn.0 for ; Sun, 22 Mar 2015 06:23:09 -0700 (PDT) Message-ID: <550EC233.9090908@gmail.com> Date: Sun, 22 Mar 2015 21:22:59 +0800 From: Kinglong Mee MIME-Version: 1.0 To: Steve Dickson CC: rees@umich.edu, Linux NFS Mailing List Subject: [PATCH] blkmapd: Make sure device root contains valid device id Content-Type: text/plain; charset=utf-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: When testing pnfs in virtual linux based on VirtualBox, blkmapd gets dev_root->len == 0, which causes it Segmentation fault. Signed-off-by: Kinglong Mee --- utils/blkmapd/device-inq.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/utils/blkmapd/device-inq.c b/utils/blkmapd/device-inq.c index eabc70c..c5bf71f 100644 --- a/utils/blkmapd/device-inq.c +++ b/utils/blkmapd/device-inq.c @@ -179,6 +179,7 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename) char *buffer; struct bl_dev_id *dev_root, *dev_id; unsigned int pos, len, current_id = 0; + size_t devid_len = sizeof(struct bl_dev_id) - sizeof(unsigned char); status = bldev_inquire_pages(fd, 0x83, &buffer); if (status) @@ -189,7 +190,11 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename) pos = 0; current_id = 0; len = dev_root->len; - while (pos < (len - sizeof(struct bl_dev_id) + sizeof(unsigned char))) { + + if (len < devid_len) + goto out; + + while (pos < (len - devid_len)) { dev_id = (struct bl_dev_id *)&(dev_root->data[pos]); if ((dev_id->ids & 0xf) < current_id) continue; @@ -221,8 +226,7 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename) } if (current_id == 3) break; - pos += (dev_id->len + sizeof(struct bl_dev_id) - - sizeof(unsigned char)); + pos += (dev_id->len + devid_len); } out: if (!serial_out) -- 2.3.3