In the Linux kernel, the following vulnerability has been resolved:
w1: therm: Fix off-by-one buffer overflow in alarms_store
The sysfs buffer passed to alarms_store() is allocated with size + 1 bytes and a NUL terminator is appended. However, the size argument does not account for this extra byte. The original code then allocated size bytes and used strcpy() to copy buf, which always writes one byte past the allocated buffer since strcpy() copies until the NUL terminator at index size.
Fix this by parsing the buf parameter directly using simple_strtoll() without allocating any intermediate memory or string copying. This removes the overflow while simplifying the code.