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bpf: btf: Avoid variable length array

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Sparse warning:
kernel/bpf/btf.c:1985:34: warning: Variable length array is used.

This patch directly uses ARRAY_SIZE().

Fixes: f80442a4cd18 ("bpf: btf: Change how section is supported in btf_header")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau
2018-05-23 11:32:36 -07:00
committed by Daniel Borkmann
parent a1c818109c
commit a2889a4c2d
1 changed files with 5 additions and 6 deletions
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11
kernel/bpf/btf.c
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@ -1981,8 +1981,7 @@ static int btf_sec_info_cmp(const void *a, const void *b)
static int btf_check_sec_info(struct btf_verifier_env *env,
u32 btf_data_size)
{
const unsigned int nr_secs = ARRAY_SIZE(btf_sec_info_offset);
struct btf_sec_info secs[nr_secs];
struct btf_sec_info secs[ARRAY_SIZE(btf_sec_info_offset)];
u32 total, expected_total, i;
const struct btf_header *hdr;
const struct btf *btf;
@ -1991,17 +1990,17 @@ static int btf_check_sec_info(struct btf_verifier_env *env,
hdr = &btf->hdr;
/* Populate the secs from hdr */
for (i = 0; i < nr_secs; i++)
for (i = 0; i < ARRAY_SIZE(btf_sec_info_offset); i++)
secs[i] = *(struct btf_sec_info *)((void *)hdr +
btf_sec_info_offset[i]);
sort(secs, nr_secs, sizeof(struct btf_sec_info),
btf_sec_info_cmp, NULL);
sort(secs, ARRAY_SIZE(btf_sec_info_offset),
sizeof(struct btf_sec_info), btf_sec_info_cmp, NULL);
/* Check for gaps and overlap among sections */
total = 0;
expected_total = btf_data_size - hdr->hdr_len;
for (i = 0; i < nr_secs; i++) {
for (i = 0; i < ARRAY_SIZE(btf_sec_info_offset); i++) {
if (expected_total < secs[i].off) {
btf_verifier_log(env, "Invalid section offset");
return -EINVAL;