bpf: Fix potential array overflow in bpf_trampoline_get_progs()

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix potential array overflow in bpf_trampoline_get_progs()

The cnt value in the 'cnt >= BPF_MAX_TRAMP_PROGS' check does not

include BPF_TRAMP_MODIFY_RETURN bpf programs, so the number of

the attached BPF_TRAMP_MODIFY_RETURN bpf programs in a trampoline

can exceed BPF_MAX_TRAMP_PROGS.

When this happens, the assignment '*progs++ = aux->prog' in

bpf_trampoline_get_progs() will cause progs array overflow as the

progs field in the bpf_tramp_progs struct can only hold at most

BPF_MAX_TRAMP_PROGS bpf programs.