Hi Kees,

I love your patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on linus/master v5.14-rc3]
[cannot apply to wireless-drivers-next/master wireless-drivers/master next-20210727]
[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/Kees-Cook/Introduce-strict-memcpy-bounds-checking/20210728-053749
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 39f9137268ee3df0047706df4e9b7357a40ffc98
config: x86_64-randconfig-s022-20210728 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/6617421fca0f2272593a2659a5cba25bf8249857
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kees-Cook/Introduce-strict-memcpy-bounds-checking/20210728-053749
        git checkout 6617421fca0f2272593a2659a5cba25bf8249857
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/gma500/ drivers/hid/

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


sparse warnings: (new ones prefixed by >>)
   drivers/hid/hid-hyperv.c:202:40: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] report_desc_size @@     got restricted __le16 [usertype] wDescriptorLength @@
   drivers/hid/hid-hyperv.c:202:40: sparse:     expected unsigned int [usertype] report_desc_size
   drivers/hid/hid-hyperv.c:202:40: sparse:     got restricted __le16 [usertype] wDescriptorLength
>> drivers/hid/hid-hyperv.c:218:9: sparse: sparse: cast from restricted __le16

vim +218 drivers/hid/hid-hyperv.c

b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  180  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  181  static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  182  				struct synthhid_device_info *device_info)
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  183  {
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  184  	int ret = 0;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  185  	struct hid_descriptor *desc;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  186  	struct mousevsc_prt_msg ack;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  187  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  188  	input_device->dev_info_status = -ENOMEM;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  189  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  190  	input_device->hid_dev_info = device_info->hid_dev_info;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  191  	desc = &device_info->hid_descriptor;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  192  	if (desc->bLength == 0)
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  193  		goto cleanup;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  194  
af13f9ed6f9aa6 Dexuan Cui       2019-11-19  195  	/* The pointer is not NULL when we resume from hibernation */
af13f9ed6f9aa6 Dexuan Cui       2019-11-19  196  	kfree(input_device->hid_desc);
a4a23f6d68ad2c Thomas Meyer     2013-06-01  197  	input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  198  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  199  	if (!input_device->hid_desc)
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  200  		goto cleanup;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  201  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  202  	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  203  	if (input_device->report_desc_size == 0) {
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  204  		input_device->dev_info_status = -EINVAL;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  205  		goto cleanup;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  206  	}
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  207  
af13f9ed6f9aa6 Dexuan Cui       2019-11-19  208  	/* The pointer is not NULL when we resume from hibernation */
af13f9ed6f9aa6 Dexuan Cui       2019-11-19  209  	kfree(input_device->report_desc);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  210  	input_device->report_desc = kzalloc(input_device->report_desc_size,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  211  					  GFP_ATOMIC);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  212  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  213  	if (!input_device->report_desc) {
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  214  		input_device->dev_info_status = -ENOMEM;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  215  		goto cleanup;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  216  	}
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  217  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17 @218  	memcpy(input_device->report_desc,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  219  	       ((unsigned char *)desc) + desc->bLength,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  220  	       desc->desc[0].wDescriptorLength);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  221  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  222  	/* Send the ack */
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  223  	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  224  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  225  	ack.type = PIPE_MESSAGE_DATA;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  226  	ack.size = sizeof(struct synthhid_device_info_ack);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  227  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  228  	ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  229  	ack.ack.header.size = 1;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  230  	ack.ack.reserved = 0;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  231  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  232  	ret = vmbus_sendpacket(input_device->device->channel,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  233  			&ack,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  234  			sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  235  			sizeof(struct synthhid_device_info_ack),
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  236  			(unsigned long)&ack,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  237  			VM_PKT_DATA_INBAND,
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  238  			VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  239  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  240  	if (!ret)
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  241  		input_device->dev_info_status = 0;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  242  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  243  cleanup:
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  244  	complete(&input_device->wait_event);
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  245  
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  246  	return;
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  247  }
b95f5bcb811e39 K. Y. Srinivasan 2011-11-17  248  

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0-DAY CI Kernel Test Service, Intel Corporation
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