[DTrace-devel] [PATCH 5/6] speculations, bpf: check for nonexistent CTF before using it

[Nick Alcock]

This turns coredumps into a not-all-that-much-more-helpful "no such file
or directory" error (but turning DT_DEBUG on at least tells you which
file is missing, i.e. some ctfa file)

Signed-off-by: Nick Alcock <nick.alcock at oracle.com>
---
 libdtrace/dt_bpf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libdtrace/dt_bpf.c b/libdtrace/dt_bpf.c
index 8b5513547d85..9b7344d02221 100644
--- a/libdtrace/dt_bpf.c
+++ b/libdtrace/dt_bpf.c
@@ -141,6 +141,9 @@ set_task_offsets(dtrace_hdl_t *dtp)
 	ctf_membinfo_t ctm;
 	ctf_file_t *cfp = dtp->dt_shared_ctf;
 
+	if (!cfp)
+		return dt_set_errno(dtp, EDT_NOCTF);
+
 	type = ctf_lookup_by_name(cfp, "struct task_struct");
 	if (type == CTF_ERR)
 		return -1;
-- 
2.35.0.260.gb82b153193.dirty