bpf: change back to orig prog on too many passes

[ Upstream commit 9d5ecb09 ]

If after too many passes still no image could be emitted, then
swap back to the original program as we do in all other cases
and don't use the one with blinding.

Fixes: 959a7579 ("bpf, x86: add support for constant blinding")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/x86/net/bpf_jit_comp.c

@@ -1172,6 +1172,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 		set_memory_ro((unsigned long)header, header->pages);
 		prog->bpf_func = (void *)image;
 		prog->jited = 1;
+	} else {
+		prog = orig_prog;
 	}
 
 out_addrs: