Re: [PATCH v3 3/3] leds: leds-lp5569: Add support for Texas Instruments LP5569

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Hi Christian,

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/Christian-Marangi/dt-bindings-leds-lp55xx-Add-new-ti-lp5569-compatible/20240527-174959
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/leds.git for-leds-next
patch link:    https://lore.kernel.org/r/20240527094737.13354-3-ansuelsmth%40gmail.com
patch subject: [PATCH v3 3/3] leds: leds-lp5569: Add support for Texas Instruments LP5569
config: sparc-randconfig-r071-20240528 (https://download.01.org/0day-ci/archive/20240528/202405280611.QUICzlRj-lkp@xxxxxxxxx/config)
compiler: sparc-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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202405280611.QUICzlRj-lkp@xxxxxxxxx/

New smatch warnings:
drivers/leds/leds-lp5569.c:378 lp5569_update_program_memory() error: buffer overflow 'pattern' 128 <= 223

vim +/pattern +378 drivers/leds/leds-lp5569.c

ed7ae4f43e228c Christian Marangi 2024-05-27  340  static int lp5569_update_program_memory(struct lp55xx_chip *chip,
ed7ae4f43e228c Christian Marangi 2024-05-27  341  					const u8 *data, size_t size)
ed7ae4f43e228c Christian Marangi 2024-05-27  342  {
ed7ae4f43e228c Christian Marangi 2024-05-27  343  	enum lp55xx_engine_index idx = chip->engine_idx;
ed7ae4f43e228c Christian Marangi 2024-05-27  344  	u8 pattern[LP5569_PROGRAM_LENGTH] = {0};
ed7ae4f43e228c Christian Marangi 2024-05-27  345  	unsigned int cmd;
ed7ae4f43e228c Christian Marangi 2024-05-27  346  	char c[3];
ed7ae4f43e228c Christian Marangi 2024-05-27  347  	int nrchars;
ed7ae4f43e228c Christian Marangi 2024-05-27  348  	int ret;
ed7ae4f43e228c Christian Marangi 2024-05-27  349  	int offset = 0;
ed7ae4f43e228c Christian Marangi 2024-05-27  350  	int page, i = 0;
ed7ae4f43e228c Christian Marangi 2024-05-27  351  
ed7ae4f43e228c Christian Marangi 2024-05-27  352  	while ((offset < size - 1) && (i < LP5569_PROGRAM_LENGTH)) {
ed7ae4f43e228c Christian Marangi 2024-05-27  353  		/* separate sscanfs because length is working only for %s */
ed7ae4f43e228c Christian Marangi 2024-05-27  354  		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
ed7ae4f43e228c Christian Marangi 2024-05-27  355  		if (ret != 1)
ed7ae4f43e228c Christian Marangi 2024-05-27  356  			goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27  357  
ed7ae4f43e228c Christian Marangi 2024-05-27  358  		ret = sscanf(c, "%2x", &cmd);
ed7ae4f43e228c Christian Marangi 2024-05-27  359  		if (ret != 1)
ed7ae4f43e228c Christian Marangi 2024-05-27  360  			goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27  361  
ed7ae4f43e228c Christian Marangi 2024-05-27  362  		pattern[i] = (u8)cmd;
ed7ae4f43e228c Christian Marangi 2024-05-27  363  		offset += nrchars;
ed7ae4f43e228c Christian Marangi 2024-05-27  364  		i++;
ed7ae4f43e228c Christian Marangi 2024-05-27  365  	}
ed7ae4f43e228c Christian Marangi 2024-05-27  366  
ed7ae4f43e228c Christian Marangi 2024-05-27  367  	/* Each instruction is 16bit long. Check that length is even */
ed7ae4f43e228c Christian Marangi 2024-05-27  368  	if (i % 2)
ed7ae4f43e228c Christian Marangi 2024-05-27  369  		goto err;
ed7ae4f43e228c Christian Marangi 2024-05-27  370  
ed7ae4f43e228c Christian Marangi 2024-05-27  371  	for (page = 0; page < LP5569_PROGRAM_LENGTH / LP5569_BYTES_PER_PAGE; page++) {
ed7ae4f43e228c Christian Marangi 2024-05-27  372  		/* Write to the next page each 32 bytes */
ed7ae4f43e228c Christian Marangi 2024-05-27  373  		lp55xx_write(chip, LP5569_REG_PROG_PAGE_SEL,
ed7ae4f43e228c Christian Marangi 2024-05-27  374  			     LP5569_PAGE_ENG(idx) + page);
ed7ae4f43e228c Christian Marangi 2024-05-27  375  
ed7ae4f43e228c Christian Marangi 2024-05-27  376  		for (i = 0; i < LP5569_PROGRAM_LENGTH; i++) {
ed7ae4f43e228c Christian Marangi 2024-05-27  377  			ret = lp55xx_write(chip, LP5569_REG_PROG_MEM + i,
ed7ae4f43e228c Christian Marangi 2024-05-27 @378  					   pattern[i + (page * LP5569_BYTES_PER_PAGE)]);
                                                                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
i can co up to LP5569_PROGRAM_LENGTH and "page * LP5569_BYTES_PER_PAGE"
can also go up to LP5569_PROGRAM_LENGTH.  So we're 2x beyond the end of
the array.

ed7ae4f43e228c Christian Marangi 2024-05-27  379  			if (ret)
ed7ae4f43e228c Christian Marangi 2024-05-27  380  				return -EINVAL;
ed7ae4f43e228c Christian Marangi 2024-05-27  381  		}
ed7ae4f43e228c Christian Marangi 2024-05-27  382  	}
ed7ae4f43e228c Christian Marangi 2024-05-27  383  
ed7ae4f43e228c Christian Marangi 2024-05-27  384  
ed7ae4f43e228c Christian Marangi 2024-05-27  385  	return size;
ed7ae4f43e228c Christian Marangi 2024-05-27  386  
ed7ae4f43e228c Christian Marangi 2024-05-27  387  err:
ed7ae4f43e228c Christian Marangi 2024-05-27  388  	dev_err(&chip->cl->dev, "wrong pattern format\n");
ed7ae4f43e228c Christian Marangi 2024-05-27  389  	return -EINVAL;
ed7ae4f43e228c Christian Marangi 2024-05-27  390  }

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





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