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AF_XDP-interaction: lib_xsk_extend: Validate 'btf_id' is last member

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Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
This commit is contained in:
Jesper Dangaard Brouer
2022-03-25 14:17:23 +01:00
parent 7715df83ee
commit 871378bd4d
1 changed files with 10 additions and 4 deletions
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14
AF_XDP-interaction/lib_xsk_extend.c
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@@ -171,10 +171,11 @@ int xsk_btf__init_xdp_hint(struct btf *btf_obj,
const char *xdp_hints_name,
struct xsk_btf_info **xbi)
{
struct xsk_btf_member btf_id;
struct xsk_btf_member btf_id_member;
const struct btf_member *m;
const struct btf_type *t;
unsigned short vlen;
__u32 member_end;
int i, id, err = 0;
if (!xbi)
@@ -212,18 +213,23 @@ int xsk_btf__init_xdp_hint(struct btf *btf_obj,
(*xbi)->btf_type_id = id;
/* Validate 'btf_id' member MUST exist */
err = __xsk_btf_field_entry((*xbi), "btf_id", &btf_id);
err = __xsk_btf_field_entry((*xbi), "btf_id", &btf_id_member);
if (err)
goto error_entry;
/* TODO: Validate 'btf_id' is last member */
/* Validate 'btf_id' is last member */
member_end = btf_id_member.offset + btf_id_member.size;
if (t->size != member_end) {
/* Situation can happen if compiler adds struct padding */
err = -EOVERFLOW;
goto error_entry;
}
return 0;
error_entry:
__xsk_btf_free_hash(*xbi);
free(*xbi);
error_btf:
return err;
}