[PATCH 0/2] hwmon: (dell-smm) Validate pwm and fan_max values

[Rosen Penev <rosenp@gmail.com>]

Two input validation fixes for dell-smm-hwmon: a huge value written to
pwmN overflowed the scaling and turned the fan off, and an out-of-range
fan_max module parameter could wrap an allocation size to zero.

These patches were developed with the help of an AI coding assistant
(Claude Opus 5.5): it reviewed the drivers, found the issues and drafted
the fixes and changelogs. I reviewed every change and I am responsible
for them.

All patches build cleanly with W=1.

Tested on a Dell Precision M4800 running v7.2.15, using the equivalent
backports built as out-of-tree modules:
fan_max=256 and fan_max=4294967295 are rejected with the new message,
fan_max=3 and the default still load. The pwm clamp could not be
observed: this machine's BIOS ignores manual pwm writes.


Rosen Penev (2):
  hwmon: (dell-smm) Clamp the pwm value before scaling it
  hwmon: (dell-smm) Reject a fan_max that the BIOS cannot take

 drivers/hwmon/dell-smm-hwmon.c | 7 +++++++
 1 file changed, 7 insertions(+)


base-commit: 2800868f63227c8237d70c41e70d441c919620d6
-- 
2.56.0