[PATCH iproute2] bpf: indicate lderr when bpf_apply_relo_data fails

[Daniel Borkmann]

When LLVM wrongly generates a rodata relo entry (llvm BZ #33599),
then just bail out instead of probing for prog w/o reloc, which
will fail in this case anyway.

Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
---
 lib/bpf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/bpf.c b/lib/bpf.c
index ae4d97d..6b5a96d 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -1795,8 +1795,10 @@ static int bpf_fetch_prog_relo(struct bpf_elf_ctx *ctx, 
const char *section,
                *sseen = true;
 
                ret = bpf_apply_relo_data(ctx, &data_relo, &data_insn);
-               if (ret < 0)
+               if (ret < 0) {
+                       *lderr = true;
                        return ret;
+               }
 
                memset(&prog, 0, sizeof(prog));
                prog.type    = ctx->type;
-- 
1.9.3