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libbpf: Make btf__resolve_size logic always check size error condition

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commit 994021a7e08477f7e51285920aac99fc967fae8a upstream.

Perform size check always in btf__resolve_size. Makes the logic a bit more
robust against corrupted BTF and silences LGTM/Coverity complaining about
always true (size < 0) check.

Fixes: 69eaab04c6 ("btf: extract BTF type size calculation")
Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Andrii Nakryiko 2019-11-06 18:08:54 -08:00 • committed by Greg Kroah-Hartman
commit 2948fecb0e
1 changed files with 1 additions and 2 deletions
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3
tools/lib/bpf/btf.c
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@ -269,10 +269,9 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
t = btf__type_by_id(btf, type_id);
}
done:
if (size < 0)
return -EINVAL;
done:
if (nelems && size > UINT32_MAX / nelems)
return -E2BIG;