Re: [PATCH] libbpf: check the btf_type kind to prevent error

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On 8/6/24 3:51 AM, Ma Ke wrote:
To prevent potential error return values, it is necessary to check the
return value of btf__type_by_id. We can add a kind checking to fix the
issue.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 430025e5dca5 ("libbpf: Add subskeleton scaffolding")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
---
  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 a3be6f8fac09..d1eb45d16054 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -13850,6 +13850,9 @@ int bpf_object__open_subskeleton(struct bpf_object_subskeleton *s)
  		var = btf_var_secinfos(map_type);
  		for (i = 0; i < len; i++, var++) {
  			var_type = btf__type_by_id(btf, var->type);
+			if (!var_type)
+				return libbpf_err(-ENOENT);

Could you give a detailed example when this error could be triggered?

+
  			var_name = btf__name_by_offset(btf, var_type->name_off);
  			if (strcmp(var_name, var_skel->name) == 0) {
  				*var_skel->addr = map->mmaped + var->offset;




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