rtc: tps6594: Fix integer overflow on 32bit systems

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: rtc: tps6594: Fix integer overflow on 32bit systems The problem is this multiply in tps6594_rtc_set_offset() tmp = offset * TICKS_PER_HOUR; The "tmp" variable is an s64 but "offset" is a long in the (-277774)-277774 range. On 32bit systems a long can hold numbers up to approximately two billion. The number of TICKS_PER_HOUR is really large, (32768 * 3600) or roughly a hundred million. When you start multiplying by a hundred million it doesn't take long to overflow the two billion mark. Probably the safest way to fix this is to change the type of TICKS_PER_HOUR to long long because it's such a large number.

References

• https://git.kernel.org/stable/c/5127f3cbfc78a7b301b86328247230bec47e0bb3
• https://git.kernel.org/stable/c/53b0c7b15accb18d15d95c7fe68f61630ebfd1ca
• https://git.kernel.org/stable/c/09c4a610153286cef54d4f0c85398f4e32fc227e