netdev - Re: [PATCH v8 bpf-next 3/5] bpf: Add skb dynptrs

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Message-ID: <befb819f-abc4-c7a1-1f82-9559542f9138@linux.dev>
Date:   Thu, 26 Jan 2023 23:58:24 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Joanne Koong <joannelkoong@...il.com>
Cc:     daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
        ast@...nel.org, netdev@...r.kernel.org, memxor@...il.com,
        kernel-team@...com, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v8 bpf-next 3/5] bpf: Add skb dynptrs

On 1/26/23 3:34 PM, Joanne Koong wrote:
> +static enum bpf_dynptr_type dynptr_get_type(struct bpf_verifier_env *env,
> +					    struct bpf_reg_state *reg)
> +{
> +	struct bpf_func_state *state = func(env, reg);
> +	int spi = __get_spi(reg->off);
> +
> +	if (spi < 0) {
> +		verbose(env, "verifier internal error: invalid spi when querying dynptr type\n");
> +		return BPF_DYNPTR_TYPE_INVALID;
> +	}
> +
> +	return state->stack[spi].spilled_ptr.dynptr.type;
> +}

CI fails: 
https://github.com/kernel-patches/bpf/actions/runs/4020275998/jobs/6908210555

My local KASAN also reports the error.