samples/bpf: fix bpf loader

llvm can emit relocations into sections other than program code
(like debug info sections). Ignore them during parsing of elf file
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

samples/bpf/bpf_load.c

@@ -317,6 +317,10 @@ int load_bpf_file(char *path)
 				    &shdr_prog, &data_prog))
 				continue;
 
+			if (shdr_prog.sh_type != SHT_PROGBITS ||
+			    !(shdr_prog.sh_flags & SHF_EXECINSTR))
+				continue;
+
 			insns = (struct bpf_insn *) data_prog->d_buf;
 
 			processed_sec[shdr.sh_info] = true;