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tools: libbpf: handle NULL program gracefully in bpf_program__nth_fd()
bpf_map__fd() handles NULL map gracefully and returns -EINVAL. bpf_program__fd() and bpf_program__nth_fd() crash in this case. Make the behaviour more consistent by validating prog pointer as well. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -1991,6 +1991,9 @@ int bpf_program__nth_fd(struct bpf_program *prog, int n)
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{
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int fd;
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if (!prog)
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return -EINVAL;
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if (n >= prog->instances.nr || n < 0) {
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pr_warning("Can't get the %dth fd from program %s: only %d instances\n",
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n, prog->section_name, prog->instances.nr);
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