From dcb2288b1fd9a8cdf2f3b8c0c7b3763346ef515f Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Wed, 7 Dec 2022 11:55:34 -0800 Subject: bpf: Remove unused insn_cnt argument from visit_[func_call_]insn() Number of total instructions in BPF program (including subprogs) can and is accessed from env->prog->len. visit_func_call_insn() doesn't do any checks against insn_cnt anymore, relying on push_insn() to do this check internally. So remove unnecessary insn_cnt input argument from visit_func_call_insn() and visit_insn() functions. Suggested-by: Alexei Starovoitov Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20221207195534.2866030-1-andrii@kernel.org --- kernel/bpf/verifier.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'kernel/bpf') diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 1f151f996203..29e09ef15188 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -12222,8 +12222,7 @@ static int push_insn(int t, int w, int e, struct bpf_verifier_env *env, return DONE_EXPLORING; } -static int visit_func_call_insn(int t, int insn_cnt, - struct bpf_insn *insns, +static int visit_func_call_insn(int t, struct bpf_insn *insns, struct bpf_verifier_env *env, bool visit_callee) { @@ -12254,13 +12253,13 @@ static int visit_func_call_insn(int t, int insn_cnt, * DONE_EXPLORING - the instruction was fully explored * KEEP_EXPLORING - there is still work to be done before it is fully explored */ -static int visit_insn(int t, int insn_cnt, struct bpf_verifier_env *env) +static int visit_insn(int t, struct bpf_verifier_env *env) { struct bpf_insn *insns = env->prog->insnsi; int ret; if (bpf_pseudo_func(insns + t)) - return visit_func_call_insn(t, insn_cnt, insns, env, true); + return visit_func_call_insn(t, insns, env, true); /* All non-branch instructions have a single fall-through edge. */ if (BPF_CLASS(insns[t].code) != BPF_JMP && @@ -12279,7 +12278,7 @@ static int visit_insn(int t, int insn_cnt, struct bpf_verifier_env *env) * async state will be pushed for further exploration. */ mark_prune_point(env, t); - return visit_func_call_insn(t, insn_cnt, insns, env, + return visit_func_call_insn(t, insns, env, insns[t].src_reg == BPF_PSEUDO_CALL); case BPF_JA: @@ -12336,7 +12335,7 @@ static int check_cfg(struct bpf_verifier_env *env) while (env->cfg.cur_stack > 0) { int t = insn_stack[env->cfg.cur_stack - 1]; - ret = visit_insn(t, insn_cnt, env); + ret = visit_insn(t, env); switch (ret) { case DONE_EXPLORING: insn_state[t] = EXPLORED; -- cgit v1.2.3