linux-kernel - Re: [PATCH v2] tracing/probes: fix error check in parse_btf

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Date: Mon, 27 May 2024 21:31:44 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Carlos López <clopez@...e.de>
Cc: linux-trace-kernel@...r.kernel.org, Steven Rostedt
 <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Alan Maguire
 <alan.maguire@...cle.com>, linux-kernel@...r.kernel.org (open list:TRACING)
Subject: Re: [PATCH v2] tracing/probes: fix error check in parse_btf_field()

On Mon, 27 May 2024 11:43:52 +0200
Carlos López <clopez@...e.de> wrote:

> btf_find_struct_member() might return NULL or an error via the
> ERR_PTR() macro. However, its caller in parse_btf_field() only checks
> for the NULL condition. Fix this by using IS_ERR() and returning the
> error up the stack.
> 

Thanks for updating! This version looks good to me.
Let me pick this to probes/fixes.

Thank you,


> Fixes: c440adfbe3025 ("tracing/probes: Support BTF based data structure field access")
> Signed-off-by: Carlos López <clopez@...e.de>
> ---
> v2: added call to trace_probe_log_err()
> 
>  kernel/trace/trace_probe.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index 5e263c141574..39877c80d6cb 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -554,6 +554,10 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
>  			anon_offs = 0;
>  			field = btf_find_struct_member(ctx->btf, type, fieldname,
>  						       &anon_offs);
> +			if (IS_ERR(field)) {
> +				trace_probe_log_err(ctx->offset, BAD_BTF_TID);
> +				return PTR_ERR(field);
> +			}
>  			if (!field) {
>  				trace_probe_log_err(ctx->offset, NO_BTF_FIELD);
>  				return -ENOENT;
> -- 
> 2.35.3
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>