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| author | Guenter Roeck <linux@roeck-us.net> | 2018-06-12 15:19:35 -0700 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2018-06-16 16:40:36 -0700 |
| commit | 91bb8f45f73f19a0150c233c0f11cdeb6d71d1e9 (patch) | |
| tree | 5ba2dea6276d352c94ab8b5fb20be09083d41ad6 /drivers/hwmon/nct6775.c | |
| parent | 536e0019b7da4eb3badb4da5acbb70ae29e1b5ef (diff) | |
| download | lwn-91bb8f45f73f19a0150c233c0f11cdeb6d71d1e9.tar.gz lwn-91bb8f45f73f19a0150c233c0f11cdeb6d71d1e9.zip | |
hwmon: (nct6775) Fix loop limit
Commit cc66b3038254 ("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: cc66b3038254 ("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>
Diffstat (limited to 'drivers/hwmon/nct6775.c')
| -rw-r--r-- | drivers/hwmon/nct6775.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index 155d4d1d1585..f9d1349c3286 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -4175,7 +4175,7 @@ static int nct6775_probe(struct platform_device *pdev) * The temperature is already monitored if the respective bit in <mask> * is set. */ - for (i = 0; i < 32; i++) { + for (i = 0; i < 31; i++) { if (!(data->temp_mask & BIT(i + 1))) continue; if (!reg_temp_alternate[i]) |