Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Clamp negative current limits When a negative value is passed to ltc4282_write_curr(), the signed long val is cast directly to u64: drivers/hwmon/ltc4282.c:ltc4282_write_curr() { /* need to pass it in millivolt */ u32 in = DIV_ROUND_CLOSEST_ULL((u64)val * st->rsense, DECA * MICRO); ... } This cast converts negative inputs into large positive values. The subsequent division result overflows the u32 in variable, truncating to a pseudo-random positive value. When this is passed to ltc4282_write_voltage_byte(), it is clamped to the maximum limit instead of zero. Clamp val to 0 and to the maximum supported upper limit before the cast and assign the result to a 64-bit temporary variable before the division to avoid the underflow and an also possible overflow.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
cbc29538dbf7d7400f1ffc5dd5713e6a551463a0 to < 60e06c4dba696173982393252a40ceb7dd2eec18affectedcbc29538dbf7d7400f1ffc5dd5713e6a551463a0 to < de58b90a4d1417c15b693eb04c0ce6bc925d84c6affectedcbc29538dbf7d7400f1ffc5dd5713e6a551463a0 to < 046e56b53c09375ef39903514496aa5508db9729affectedcbc29538dbf7d7400f1ffc5dd5713e6a551463a0 to < e253dd5f9f6d875a317895bf43ec9534ed7523cbaffected
Linux Linux
Default version status: affected
6.9affected0 to < 6.9unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected