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hwmon: (nct6775) Fix loop limit 

Commit cc66b30382 ("hwmon: (nct6775) Rework temperature source and label
handling") changed a loop limit from "data->temp_label_num - 1" to "32",
as part of moving from a string array to a bit mask. This results in the
following error, reported by UBSAN.

UBSAN: Undefined behaviour in drivers/hwmon/nct6775.c:4179:27
shift exponent 32 is too large for 32-bit type 'long unsigned int'

Similar to the original loop, the limit has to be one less than the
number of bits.

Fixes: cc66b30382 ("hwmon: (nct6775) Rework temperature source and label handling")
Reported-by: Paul Menzel <pmenzel+linux-hwmon@molgen.mpg.de>
Cc: Paul Menzel <pmenzel+linux-hwmon@molgen.mpg.de>
Tested-by: Paul Menzel <pmenzel+linux-hwmon@molgen.mpg.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2018-06-12 15:19:35 -07:00
parent 536e0019b7
commit 91bb8f45f7
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/nct6775.c
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@ -4175,7 +4175,7 @@ static int nct6775_probe(struct platform_device *pdev)
* The temperature is already monitored if the respective bit in <mask> * The temperature is already monitored if the respective bit in <mask>
* is set. * is set.
*/ */
for (i = 0; i < 32; i++) { for (i = 0; i < 31; i++) {
if (!(data->temp_mask & BIT(i + 1))) if (!(data->temp_mask & BIT(i + 1)))
continue; continue;
if (!reg_temp_alternate[i]) if (!reg_temp_alternate[i])