Handle invalid root_type_ids early, as an invalid ID will cause dumpers
to half-emit valid boilerplate and then bail with an unclean exit. This
is ugly and possibly confusing for users, so preemptively handle the
common error case before any dumping begins.
Signed-off-by: Daniel Xu <dxu@xxxxxxxxx>
---
tools/bpf/bpftool/btf.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index d005e4fd6128..3e995faf9efa 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -886,6 +886,7 @@ static int do_dump(int argc, char **argv)
const char *src;
int fd = -1;
int err = 0;
+ int i;
if (!REQ_ARGS(2)) {
usage();
@@ -1017,6 +1018,17 @@ static int do_dump(int argc, char **argv)
}
}
+ /* Invalid root IDs causes half emitted boilerplate and then unclean
+ * exit. It's an ugly user experience, so handle common error here.
+ */
+ for (i = 0; i < root_type_cnt; i++) {
+ if (root_type_ids[i] >= btf__type_cnt(btf)) {
+ err = -EINVAL;
+ p_err("invalid root ID: %u", root_type_ids[i]);
+ goto done;
+ }
+ }
+
if (dump_c) {
if (json_output) {
p_err("JSON output for C-syntax dump is not supported");
--
2.46.0
