Re: [PATCH 5/6] nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM

[kernel test robot <lkp@intel.com>]

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Hi Théo,

kernel test robot noticed the following build errors:

[auto build test ERROR on 40384c840ea1944d7c5a392e8975ed088ecf0b37]

url:    https://github.com/intel-lab-lkp/linux/commits/Th-o-Lebrun/dt-bindings-nvmem-rmem-Add-mobileye-eyeq5-bootloader-config/20241204-103417
base:   40384c840ea1944d7c5a392e8975ed088ecf0b37
patch link:    https://lore.kernel.org/r/20241203-rmem-v1-5-24f4970cf14e%40bootlin.com
patch subject: [PATCH 5/6] nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM
config: arm-randconfig-002 (https://download.01.org/0day-ci/archive/20241204/202412041522.01H5Kj6F-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241204/202412041522.01H5Kj6F-lkp@intel.com/reproduce)

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412041522.01H5Kj6F-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/nvmem/rmem.c: In function 'rmem_eyeq5_checksum':
   drivers/nvmem/rmem.c:66:9: error: cleanup argument not a function
      66 |         void *buf __free(kfree) = NULL;
         |         ^~~~
   drivers/nvmem/rmem.c:97:15: error: implicit declaration of function 'kmalloc'; did you mean 'mm_alloc'? [-Wimplicit-function-declaration]
      97 |         buf = kmalloc(header.size, GFP_KERNEL);
         |               ^~~~~~~
         |               mm_alloc
>> drivers/nvmem/rmem.c:97:13: error: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      97 |         buf = kmalloc(header.size, GFP_KERNEL);
         |             ^


vim +97 drivers/nvmem/rmem.c

    62	
    63	static int rmem_eyeq5_checksum(struct rmem *priv)
    64	{
    65		struct rmem_eyeq5_header header;
    66		void *buf __free(kfree) = NULL;
    67		u32 computed_crc, *target_crc;
    68		size_t data_size;
    69		int ret;
    70	
    71		ret = rmem_read(priv, 0, &header, sizeof(header));
    72		if (ret)
    73			return ret;
    74	
    75		if (header.magic != RMEM_EYEQ5_MAGIC)
    76			return -EINVAL;
    77	
    78		/*
    79		 * Avoid massive kmalloc() if header read is invalid;
    80		 * the check would be done by the next rmem_read() anyway.
    81		 */
    82		if (header.size > priv->mem->size)
    83			return -EINVAL;
    84	
    85		/*
    86		 *           0 +-------------------+
    87		 *             | Header (12 bytes) | \
    88		 *             +-------------------+ |
    89		 *             |                   | | data to be CRCed
    90		 *             |        ...        | |
    91		 *             |                   | /
    92		 *   data_size +-------------------+
    93		 *             |   CRC (4 bytes)   |
    94		 * header.size +-------------------+
    95		 */
    96	
  > 97		buf = kmalloc(header.size, GFP_KERNEL);
    98		if (!buf)
    99			return -ENOMEM;
   100	
   101		ret = rmem_read(priv, 0, buf, header.size);
   102		if (ret)
   103			return ret;
   104	
   105		data_size = header.size - sizeof(*target_crc);
   106		target_crc = buf + data_size;
   107		computed_crc = crc32(U32_MAX, buf, data_size) ^ U32_MAX;
   108	
   109		if (computed_crc == *target_crc)
   110			return 0;
   111	
   112		dev_err(priv->dev,
   113			"checksum failed: computed %#x, expected %#x, header (%#x, %#x, %#x)\n",
   114			computed_crc, *target_crc, header.magic, header.version, header.size);
   115		return -EINVAL;
   116	}
   117	

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