diff options
| author | Ian Rogers <irogers@google.com> | 2021-05-05 02:49:10 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-05-05 21:29:33 +0300 |
| commit | 9683e5775c75097c46bd24e65411b16ac6c6cbb3 (patch) | |
| tree | e217f762417abfa1afc7ff057d3245763dd752d7 | |
| parent | 1682d8df20aa505f6ab12c76e934b26ede39c529 (diff) | |
| download | linux-9683e5775c75097c46bd24e65411b16ac6c6cbb3.tar.xz | |
libbpf: Add NULL check to add_dummy_ksym_var
Avoids a segv if btf isn't present. Seen on the call path
__bpf_object__open calling bpf_object__collect_externs.
Fixes: 5bd022ec01f0 (libbpf: Support extern kernel function)
Suggested-by: Stanislav Fomichev <sdf@google.com>
Suggested-by: Petar Penkov <ppenkov@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210504234910.976501-1-irogers@google.com
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index e2a3cf437814..c41d9b2b59ac 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -3216,6 +3216,9 @@ static int add_dummy_ksym_var(struct btf *btf) const struct btf_var_secinfo *vs; const struct btf_type *sec; + if (!btf) + return 0; + sec_btf_id = btf__find_by_name_kind(btf, KSYMS_SEC, BTF_KIND_DATASEC); if (sec_btf_id < 0) |