From: Eliav Farber farbere@amazon.com
[ Upstream commit 81114fc3d27bf5b06b2137d2fd2b63da656a8b90 ]
Bug - in case "intel,vm-map" is missing in device-tree ,'num' is set to 0, and no voltage channel infos are allocated.
The reason num is set to 0 when "intel,vm-map" is missing is to set the entire pvt->vm_idx[] with incremental channel numbers, but it didn't take into consideration that same num is used later in devm_kcalloc().
If "intel,vm-map" does exist there is no need to set the unspecified channels with incremental numbers, because the unspecified channels can't be accessed in pvt_read_in() which is the only other place besides the probe functions that uses pvt->vm_idx[].
This change fixes the bug by moving the incremental channel numbers setting to be done only if "intel,vm-map" property is defined (starting loop from 0), and removing 'num = 0'.
Fixes: 9d823351a337 ("hwmon: Add hardware monitoring driver for Moortec MR75203 PVT controller") Signed-off-by: Eliav Farber farbere@amazon.com Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20220908152449.35457-3-farbere@amazon.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/mr75203.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c index 1ba1e31459690..36cbc86033ce9 100644 --- a/drivers/hwmon/mr75203.c +++ b/drivers/hwmon/mr75203.c @@ -594,7 +594,12 @@ static int mr75203_probe(struct platform_device *pdev) ret = device_property_read_u8_array(dev, "intel,vm-map", pvt->vm_idx, vm_num); if (ret) { - num = 0; + /* + * Incase intel,vm-map property is not defined, we + * assume incremental channel numbers. + */ + for (i = 0; i < vm_num; i++) + pvt->vm_idx[i] = i; } else { for (i = 0; i < vm_num; i++) if (pvt->vm_idx[i] >= vm_num || @@ -604,13 +609,6 @@ static int mr75203_probe(struct platform_device *pdev) } }
- /* - * Incase intel,vm-map property is not defined, we assume - * incremental channel numbers. - */ - for (i = num; i < vm_num; i++) - pvt->vm_idx[i] = i; - in_config = devm_kcalloc(dev, num + 1, sizeof(*in_config), GFP_KERNEL); if (!in_config)