[PATCH] 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 <redacted>
Suggested-by: Petar Penkov <redacted>
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/lib/bpf/libbpf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index de9a5b0118fe..97d9a1c2d680 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)

-- 
2.31.1.607.g51e8a6a459-goog

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Tue,  4 May 2021 16:49:10 -0700 you wrote:

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 <redacted>
Suggested-by: Petar Penkov <redacted>
Signed-off-by: Ian Rogers <irogers@google.com>

[...]

Here is the summary with links:
  - libbpf: Add NULL check to add_dummy_ksym_var
    https://git.kernel.org/bpf/bpf/c/9683e5775c75

You are awesome, thank you!
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