There is a double free on data if the goto is taken on line 1815. julia ---------- Forwarded message ---------- Date: Sat, 15 Jul 2017 21:07:03 +0800 From: kbuild test robot <fengguang.wu@xxxxxxxxx> To: kbuild@xxxxxx Cc: Julia Lawall <julia.lawall@xxxxxxx> Subject: Re: [PATCH 1/3] [media] uvcvideo: variable size controls CC: kbuild-all@xxxxxx In-Reply-To: <20170714201424.23592-1-philipp.zabel@xxxxxxxxx> TO: Philipp Zabel <philipp.zabel@xxxxxxxxx> CC: linux-media@xxxxxxxxxxxxxxx, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>, Philipp Zabel <philipp.zabel@xxxxxxxxx> CC: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>, Philipp Zabel <philipp.zabel@xxxxxxxxx> Hi Philipp, [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v4.12 next-20170714] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Philipp-Zabel/uvcvideo-variable-size-controls/20170715-193137 base: git://linuxtv.org/media_tree.git master :::::: branch date: 2 hours ago :::::: commit date: 2 hours ago >> drivers/media/usb/uvc/uvc_ctrl.c:1857:7-11: ERROR: reference preceded by free on line 1809 git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout f06e94cde314fba5859cd6c999dde48e94156c7a vim +1857 drivers/media/usb/uvc/uvc_ctrl.c 52c58ad6f drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 1719 8e113595e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2009-07-01 1720 int uvc_xu_ctrl_query(struct uvc_video_chain *chain, fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1721 struct uvc_xu_control_query *xqry) c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1722 { c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1723 struct uvc_entity *entity; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1724 struct uvc_control *ctrl; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1725 unsigned int i, found = 0; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1726 __u32 reqflags; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1727 __u16 size; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1728 __u8 *data = NULL; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1729 int ret; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1730 c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1731 /* Find the extension unit. */ 6241d8ca1 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2009-11-25 1732 list_for_each_entry(entity, &chain->entities, chain) { 6241d8ca1 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2009-11-25 1733 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT && fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1734 entity->id == xqry->unit) c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1735 break; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1736 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1737 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1738 if (entity->id != xqry->unit) { c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1739 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n", fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1740 xqry->unit); fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1741 return -ENOENT; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1742 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1743 52c58ad6f drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 1744 /* Find the control and perform delayed initialization if needed. */ c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1745 for (i = 0; i < entity->ncontrols; ++i) { c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1746 ctrl = &entity->controls[i]; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1747 if (ctrl->index == xqry->selector - 1) { c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1748 found = 1; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1749 break; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1750 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1751 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1752 c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1753 if (!found) { 36bd883ef drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-01-19 1754 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n", fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1755 entity->extension.guidExtensionCode, xqry->selector); fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1756 return -ENOENT; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1757 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1758 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1759 if (mutex_lock_interruptible(&chain->ctrl_mutex)) 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1760 return -ERESTARTSYS; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1761 52c58ad6f drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 1762 ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl); 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1763 if (ret < 0) { 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1764 ret = -ENOENT; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1765 goto done; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1766 } 52c58ad6f drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 1767 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1768 /* Validate the required buffer size and flags for the request */ fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1769 reqflags = 0; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1770 size = ctrl->info.size; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1771 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1772 switch (xqry->query) { fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1773 case UVC_GET_CUR: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1774 reqflags = UVC_CTRL_FLAG_GET_CUR; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1775 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1776 case UVC_GET_MIN: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1777 reqflags = UVC_CTRL_FLAG_GET_MIN; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1778 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1779 case UVC_GET_MAX: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1780 reqflags = UVC_CTRL_FLAG_GET_MAX; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1781 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1782 case UVC_GET_DEF: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1783 reqflags = UVC_CTRL_FLAG_GET_DEF; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1784 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1785 case UVC_GET_RES: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1786 reqflags = UVC_CTRL_FLAG_GET_RES; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1787 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1788 case UVC_SET_CUR: 9eb30d2fa drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-11-21 1789 reqflags = UVC_CTRL_FLAG_SET_CUR; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1790 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1791 case UVC_GET_LEN: fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1792 size = 2; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1793 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1794 case UVC_GET_INFO: fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1795 size = 1; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1796 break; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1797 default: 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1798 ret = -EINVAL; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1799 goto done; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1800 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1801 f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1802 if ((ctrl->info.flags & UVC_CTRL_FLAG_VARIABLE_LEN) && reqflags) { f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1803 data = kmalloc(2, GFP_KERNEL); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1804 /* Check if the control length has changed */ f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1805 ret = uvc_query_ctrl(chain->dev, UVC_GET_LEN, xqry->unit, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1806 chain->dev->intfnum, xqry->selector, data, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1807 2); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1808 size = le16_to_cpup((__le16 *)data); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 @1809 kfree(data); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1810 if (ret < 0) { f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1811 uvc_trace(UVC_TRACE_CONTROL, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1812 "GET_LEN failed on control %pUl/%u (%d).\n", f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1813 entity->extension.guidExtensionCode, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1814 xqry->selector, ret); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1815 goto done; f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1816 } f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1817 if (ctrl->info.size != size) { f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1818 uvc_trace(UVC_TRACE_CONTROL, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1819 "XU control %pUl/%u queried: len %u -> %u\n", f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1820 entity->extension.guidExtensionCode, f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1821 xqry->selector, ctrl->info.size, size); f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1822 ctrl->info.size = size; f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1823 } f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1824 } f06e94cde drivers/media/usb/uvc/uvc_ctrl.c Philipp Zabel 2017-07-14 1825 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1826 if (size != xqry->size) { fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1827 ret = -ENOBUFS; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1828 goto done; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1829 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1830 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1831 if (reqflags && !(ctrl->info.flags & reqflags)) { fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1832 ret = -EBADRQC; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1833 goto done; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1834 } fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1835 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1836 data = kmalloc(size, GFP_KERNEL); fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1837 if (data == NULL) { fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1838 ret = -ENOMEM; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1839 goto done; fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1840 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1841 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1842 if (xqry->query == UVC_SET_CUR && fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1843 copy_from_user(data, xqry->data, size)) { c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1844 ret = -EFAULT; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1845 goto done; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1846 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1847 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1848 ret = uvc_query_ctrl(chain->dev, xqry->query, xqry->unit, fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1849 chain->dev->intfnum, xqry->selector, data, size); c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1850 if (ret < 0) 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1851 goto done; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1852 fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1853 if (xqry->query != UVC_SET_CUR && fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 1854 copy_to_user(xqry->data, data, size)) c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1855 ret = -EFAULT; 27a61c13e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-10-02 1856 done: fe78d187f drivers/media/video/uvc/uvc_ctrl.c Martin Rubli 2010-10-02 @1857 kfree(data); 8e113595e drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2009-07-01 1858 mutex_unlock(&chain->ctrl_mutex); c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1859 return ret; c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1860 } c0efd2329 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2008-06-30 1861 :::::: The code at line 1857 was first introduced by commit :::::: fe78d187fe792fac5d190b19a2806c23df28891e [media] uvcvideo: Add UVCIOC_CTRL_QUERY ioctl :::::: TO: Martin Rubli <martin_rubli@xxxxxxxxxxxx> :::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
