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libbpf: avoid NULL deref when initializing map BTF info

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If BPF object doesn't have an BTF info, don't attempt to search for BTF
types describing BPF map key or value layout.

Fixes: 262cfb74ffda ("libbpf: Init btf_{key,value}_type_id on internal map open")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
This commit is contained in:
Andrii Nakryiko
2022-03-19 17:16:16 -07:00
committed by Andrii Nakryiko
parent f1b6bc31a5
commit 7db9ce5fda
1 changed files with 3 additions and 0 deletions
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src/libbpf.c
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@@ -4197,6 +4197,9 @@ static int bpf_map_find_btf_info(struct bpf_object *obj, struct bpf_map *map)
__u32 key_type_id = 0, value_type_id = 0;
int ret;
if (!obj->btf)
return -ENOENT;
/* if it's BTF-defined map, we don't need to search for type IDs.
* For struct_ops map, it does not need btf_key_type_id and
* btf_value_type_id.