linux-kernel - Re: [PATCH] USB: core: limit access to rawdescriptors which were not allocated

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Message-ID: <202008260522.hjjt3Qro%lkp@intel.com>
Date:   Wed, 26 Aug 2020 05:35:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     yanfei.xu@...driver.com, gregkh@...uxfoundation.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: core: limit access to rawdescriptors which were not
 allocated

Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on balbi-usb/testing/next peter.chen-usb/ci-for-usb-next v5.9-rc2 next-20200825]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/yanfei-xu-windriver-com/USB-core-limit-access-to-rawdescriptors-which-were-not-allocated/20200826-002050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: arm-randconfig-r015-20200826 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 77e5a195f818b9ace91f7b12ab948b21d7918238)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> drivers/usb/core/sysfs.c:899:12: error: use of undeclared identifier 'USB_MAXCONFIG'
                           cfgno < USB_MAXCONFIG; ++cfgno) {
                                   ^
   1 error generated.

# https://github.com/0day-ci/linux/commit/dda85cff0852edc4723d1175486a50024ee7289a
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review yanfei-xu-windriver-com/USB-core-limit-access-to-rawdescriptors-which-were-not-allocated/20200826-002050
git checkout dda85cff0852edc4723d1175486a50024ee7289a
vim +/USB_MAXCONFIG +899 drivers/usb/core/sysfs.c

   880	
   881	static ssize_t
   882	read_descriptors(struct file *filp, struct kobject *kobj,
   883			struct bin_attribute *attr,
   884			char *buf, loff_t off, size_t count)
   885	{
   886		struct device *dev = kobj_to_dev(kobj);
   887		struct usb_device *udev = to_usb_device(dev);
   888		size_t nleft = count;
   889		size_t srclen, n;
   890		int cfgno;
   891		void *src;
   892	
   893		/* The binary attribute begins with the device descriptor.
   894		 * Following that are the raw descriptor entries for all the
   895		 * configurations (config plus subsidiary descriptors).
   896		 */
   897		for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
   898				nleft > 0 &&
 > 899				cfgno < USB_MAXCONFIG; ++cfgno) {
   900			if (cfgno < 0) {
   901				src = &udev->descriptor;
   902				srclen = sizeof(struct usb_device_descriptor);
   903			} else {
   904				src = udev->rawdescriptors[cfgno];
   905				srclen = __le16_to_cpu(udev->config[cfgno].desc.
   906						wTotalLength);
   907			}
   908			if (off < srclen) {
   909				n = min(nleft, srclen - (size_t) off);
   910				memcpy(buf, src + off, n);
   911				nleft -= n;
   912				buf += n;
   913				off = 0;
   914			} else {
   915				off -= srclen;
   916			}
   917		}
   918		return count - nleft;
   919	}
   920	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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