CVE-2023-52462 bpf: fix check for attempt to corrupt spilled pointer

In the Linux kernel, the following vulnerability has been resolved: bpf: fix check for attempt to corrupt spilled pointer When register is spilled onto a stack as a 1/2/4-byte register, we set slottypeBPFREGSIZE - 1 plus potentially few more below it, depending on actual spill size. So to check i...