regulator: pfuze100: Fix the global-out-of-bounds access in pfuze100_regulator_probe()

The pfuze_chip::regulator_descs is an array of size
PFUZE100_MAX_REGULATOR, the pfuze_chip::pfuze_regulators
is the pointer to the real regulators of a specific device.
The number of real regulator is supposed to be less than
the PFUZE100_MAX_REGULATOR, so we should use the size of
'regulator_num * sizeof(struct pfuze_regulator)' in memcpy().
This fixes the out of bounds access bug reported by KASAN.
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Link: https://lore.kernel.org/r/20220825111922.1368055-1-xiaolei.wang@windriver.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/pfuze100-regulator.c

@@ -766,7 +766,7 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
 		((pfuze_chip->chip_id == PFUZE3000) ? "3000" : "3001"))));
 
 	memcpy(pfuze_chip->regulator_descs, pfuze_chip->pfuze_regulators,
-		sizeof(pfuze_chip->regulator_descs));
+		regulator_num * sizeof(struct pfuze_regulator));
 
 	ret = pfuze_parse_regulators_dt(pfuze_chip);
 	if (ret)