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libbpf: Tighten BTF type ID rewriting with error checking

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It should never fail, but if it does, it's better to know about this rather
than end up with nonsensical type IDs.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-11-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-04-23 11:13:40 -07:00 committed by Andrii Nakryiko
parent 692ae888bc
commit 7078c5eae4
1 changed files with 7 additions and 0 deletions
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7
src/linker.c
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@ -1429,6 +1429,13 @@ static int linker_fixup_btf(struct src_obj *obj)
static int remap_type_id(__u32 *type_id, void *ctx) static int remap_type_id(__u32 *type_id, void *ctx)
{ {
int *id_map = ctx; int *id_map = ctx;
int new_id = id_map[*type_id];
/* Error out if the type wasn't remapped. Ignore VOID which stays VOID. */
if (new_id == 0 && *type_id != 0) {
pr_warn("failed to find new ID mapping for original BTF type ID %u\n", *type_id);
return -EINVAL;
}
*type_id = id_map[*type_id]; *type_id = id_map[*type_id];