linux-kernel - Re: [PATCH v3] HID: hid-goodix: Add Goodix HID-over-SPI driver

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Date: Mon, 10 Jun 2024 12:39:54 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Charles Wang <charles.goodix@...il.com>,
	dmitry.torokhov@...il.com, jikos@...nel.org, bentiss@...nel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, hbarnor@...omium.org,
	dianders@...omium.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Charles Wang <charles.goodix@...il.com>
Subject: Re: [PATCH v3] HID: hid-goodix: Add Goodix HID-over-SPI driver

Hi Charles,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Charles-Wang/HID-hid-goodix-Add-Goodix-HID-over-SPI-driver/20240607-214042
base:   https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-next
patch link:    https://lore.kernel.org/r/20240607133709.3518-1-charles.goodix%40gmail.com
patch subject: [PATCH v3] HID: hid-goodix: Add Goodix HID-over-SPI driver
config: sparc64-randconfig-r071-20240609 (https://download.01.org/0day-ci/archive/20240610/202406101633.1RJnij1Y-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 13.2.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202406101633.1RJnij1Y-lkp@intel.com/

smatch warnings:
drivers/hid/hid-goodix-spi.c:217 goodix_hid_parse() error: uninitialized symbol 'rdesc'.

vim +/rdesc +217 drivers/hid/hid-goodix-spi.c

bb11c3a1740813 Charles Wang 2024-06-07  214  static int goodix_hid_parse(struct hid_device *hid)
bb11c3a1740813 Charles Wang 2024-06-07  215  {
bb11c3a1740813 Charles Wang 2024-06-07  216  	struct goodix_ts_data *ts = hid->driver_data;
bb11c3a1740813 Charles Wang 2024-06-07 @217  	u8 *rdesc __free(kfree);
bb11c3a1740813 Charles Wang 2024-06-07  218  	u16 rsize;
bb11c3a1740813 Charles Wang 2024-06-07  219  	int error;
bb11c3a1740813 Charles Wang 2024-06-07  220  
bb11c3a1740813 Charles Wang 2024-06-07  221  	rsize = le16_to_cpu(ts->hid_desc.report_desc_lenght);
bb11c3a1740813 Charles Wang 2024-06-07  222  	if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
bb11c3a1740813 Charles Wang 2024-06-07  223  		dev_err(ts->dev, "invalid report desc size %d", rsize);
bb11c3a1740813 Charles Wang 2024-06-07  224  		return -EINVAL;
                                                        ^^^^^^^^^^^^^^^
rdesc isn't initialized here.  It should be declared as:

	u8 *rdesc __free(kfree) = NULL;

bb11c3a1740813 Charles Wang 2024-06-07  225  	}
bb11c3a1740813 Charles Wang 2024-06-07  226  
bb11c3a1740813 Charles Wang 2024-06-07  227  	rdesc = kzalloc(rsize, GFP_KERNEL);

Or it could be declared here instead.

	u8 *rdesc __free(kfree) = kzalloc(rsize, GFP_KERNEL);

bb11c3a1740813 Charles Wang 2024-06-07  228  	if (!rdesc)
bb11c3a1740813 Charles Wang 2024-06-07  229  		return -ENOMEM;
bb11c3a1740813 Charles Wang 2024-06-07  230  
bb11c3a1740813 Charles Wang 2024-06-07  231  	error = goodix_spi_read(ts, GOODIX_HID_REPORT_DESC_ADDR, rdesc, rsize);
bb11c3a1740813 Charles Wang 2024-06-07  232  	if (error) {
bb11c3a1740813 Charles Wang 2024-06-07  233  		dev_err(ts->dev, "failed get report desc, %d", error);
bb11c3a1740813 Charles Wang 2024-06-07  234  		return error;
bb11c3a1740813 Charles Wang 2024-06-07  235  	}
bb11c3a1740813 Charles Wang 2024-06-07  236  
bb11c3a1740813 Charles Wang 2024-06-07  237  	error = hid_parse_report(hid, rdesc, rsize);
bb11c3a1740813 Charles Wang 2024-06-07  238  	if (error)
bb11c3a1740813 Charles Wang 2024-06-07  239  		dev_err(ts->dev, "failed parse report, %d", error);
bb11c3a1740813 Charles Wang 2024-06-07  240  
bb11c3a1740813 Charles Wang 2024-06-07  241  	return error;
bb11c3a1740813 Charles Wang 2024-06-07  242  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki