[linux-next:master 5126/5916] drivers/hwmon/axiado-tsadc.c:142 axiado_tsadc_raw_to_mc() error: buffer overflow 'axiado_tsadc_table' 34 <= 34

[linux-next:master 5126/5916] drivers/hwmon/axiado-tsadc.c:142 axiado_tsadc_raw_to_mc() error: buffer overflow 'axiado_tsadc_table' 34 <= 34

[kernel test robot]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Petar Stepanovic <pstepanovic@axiado.com>
CC: Guenter Roeck <linux@roeck-us.net>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   68142f986ff04b2b70b31db00f719bf690f64a9a
commit: 94761a45a7544d0d694767898327b2f797a47fe7 [5126/5916] hwmon: axiado-tsadc: Add AX3000/AX3005 TSADC support
:::::: branch date: 23 hours ago
:::::: commit date: 3 days ago
config: powerpc64-randconfig-r072-20260911 (https://download.01.org/0day-ci/archive/20260912/202609121642.l9tp42kr-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 707c032dae3bee24eae29c6f4c459a6d6dc6556d)
smatch: v0.5.0-9187-g5189e3fb

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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202609121642.l9tp42kr-lkp@intel.com/

New smatch warnings:
drivers/hwmon/axiado-tsadc.c:142 axiado_tsadc_raw_to_mc() error: buffer overflow 'axiado_tsadc_table' 34 <= 34

Old smatch warnings:
drivers/hwmon/axiado-tsadc.c:144 axiado_tsadc_raw_to_mc() error: buffer overflow 'axiado_tsadc_table' 34 <= 34

vim +/axiado_tsadc_table +142 drivers/hwmon/axiado-tsadc.c

94761a45a7544d Petar Stepanovic 2026-09-03  113  
94761a45a7544d Petar Stepanovic 2026-09-03  114  /* Convert raw ADC code to millidegrees Celsius with linear interpolation. */
94761a45a7544d Petar Stepanovic 2026-09-03  115  static int axiado_tsadc_raw_to_mc(u32 raw, long *val)
94761a45a7544d Petar Stepanovic 2026-09-03  116  {
94761a45a7544d Petar Stepanovic 2026-09-03  117  	int i, n = ARRAY_SIZE(axiado_tsadc_table);
94761a45a7544d Petar Stepanovic 2026-09-03  118  	long num, denom;
94761a45a7544d Petar Stepanovic 2026-09-03  119  
94761a45a7544d Petar Stepanovic 2026-09-03  120  	if (raw >= axiado_tsadc_table[0].raw) {
94761a45a7544d Petar Stepanovic 2026-09-03  121  		*val = axiado_tsadc_table[0].temp_mc;
94761a45a7544d Petar Stepanovic 2026-09-03  122  		return 0;
94761a45a7544d Petar Stepanovic 2026-09-03  123  	}
94761a45a7544d Petar Stepanovic 2026-09-03  124  
94761a45a7544d Petar Stepanovic 2026-09-03  125  	if (raw <= axiado_tsadc_table[n - 1].raw) {
94761a45a7544d Petar Stepanovic 2026-09-03  126  		*val = axiado_tsadc_table[n - 1].temp_mc;
94761a45a7544d Petar Stepanovic 2026-09-03  127  		return 0;
94761a45a7544d Petar Stepanovic 2026-09-03  128  	}
94761a45a7544d Petar Stepanovic 2026-09-03  129  
94761a45a7544d Petar Stepanovic 2026-09-03  130  	/* Find i such that axiado_tsadc_table[i].raw >= raw > axiado_tsadc_table[i+1].raw */
94761a45a7544d Petar Stepanovic 2026-09-03  131  	for (i = 0; i < n - 1; i++) {
94761a45a7544d Petar Stepanovic 2026-09-03  132  		if (raw >= axiado_tsadc_table[i + 1].raw)
94761a45a7544d Petar Stepanovic 2026-09-03  133  			break;
94761a45a7544d Petar Stepanovic 2026-09-03  134  	}
94761a45a7544d Petar Stepanovic 2026-09-03  135  
94761a45a7544d Petar Stepanovic 2026-09-03  136  	if (raw == axiado_tsadc_table[i].raw) {
94761a45a7544d Petar Stepanovic 2026-09-03  137  		*val = axiado_tsadc_table[i].temp_mc;
94761a45a7544d Petar Stepanovic 2026-09-03  138  		return 0;
94761a45a7544d Petar Stepanovic 2026-09-03  139  	}
94761a45a7544d Petar Stepanovic 2026-09-03  140  
94761a45a7544d Petar Stepanovic 2026-09-03  141  	/* Linear interpolation within the interval */
94761a45a7544d Petar Stepanovic 2026-09-03 @142  	num = (long)(axiado_tsadc_table[i + 1].temp_mc - axiado_tsadc_table[i].temp_mc) *
94761a45a7544d Petar Stepanovic 2026-09-03  143  	      (axiado_tsadc_table[i].raw - raw);
94761a45a7544d Petar Stepanovic 2026-09-03  144  	denom = axiado_tsadc_table[i].raw - axiado_tsadc_table[i + 1].raw;
94761a45a7544d Petar Stepanovic 2026-09-03  145  	*val = axiado_tsadc_table[i].temp_mc + num / denom;
94761a45a7544d Petar Stepanovic 2026-09-03  146  	return 0;
94761a45a7544d Petar Stepanovic 2026-09-03  147  }
94761a45a7544d Petar Stepanovic 2026-09-03  148  

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