Buffer overread in pv88090-regulator.ko
From: Anton Vasilyev
Date: Tue Aug 01 2017 - 12:05:51 EST
While searching for memory errors in Linux kernel I've come across
Buffer overread could occur at pv88090_i2c_probe():
If read from malicious device such values for conf2 and range
(e.g. 0x10000000 and 0x1000 for PV88090_ID_BUCK2) that
conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
range = (range >>
(PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
become 1 then
index = ((range << 1) | conf2);
become 3, but index is used for dereference pv88090_buck_vol.
Should be index=3 considered as incorrect value and pv88090_i2c_probe()
must return error,
or pv88090_buck_vol should be expanded?
Found by Linux Driver Verification project (linuxtesting.org).
Linux Verification Center, ISPRAS