ptp: ocp: Limit signal/freq counts in summary output functions

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: Limit signal/freq counts in summary output functions The debugfs summary output could access uninitialized elements in the freq_in[] and signal_out[] arrays, causing NULL pointer dereferences and triggering a kernel Oops (page_fault_oops). This patch adds u8 fields (nr_freq_in, nr_signal_out) to track the number of initialized elements, with a maximum of 4 per array. The summary output functions are updated to respect these limits, preventing out-of-bounds access and ensuring safe array handling. Widen the label variables because the change confuses GCC about max length of the strings.

References

• https://git.kernel.org/stable/c/0b7d3e782027ac3b6fec56159e8e348042000aef
• https://git.kernel.org/stable/c/fcad74f894ac89790084cc2e1ec61b08220941d1
• https://git.kernel.org/stable/c/c9e455581e2ba87ee38c126e8dc49a424b9df0cf