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bpf: Replace hard-coded 0 with BPF_K in check_alu_op

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Enhance readability a bit.

Signed-off-by: Simon Wang <wangchuanguo@inspur.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220622031923.65692-1-wangchuanguo@inspur.com
This commit is contained in:
Simon Wang 2022-06-21 23:19:23 -04:00 committed by Daniel Borkmann
parent 6dc7a0baf1
commit 395e942d34
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/verifier.c
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@ -9096,7 +9096,7 @@ static int check_alu_op(struct bpf_verifier_env *env, struct bpf_insn *insn)
if (opcode == BPF_END || opcode == BPF_NEG) {
if (opcode == BPF_NEG) {
if (BPF_SRC(insn->code) != 0 ||
if (BPF_SRC(insn->code) != BPF_K ||
insn->src_reg != BPF_REG_0 ||
insn->off != 0 || insn->imm != 0) {
verbose(env, "BPF_NEG uses reserved fields\n");