linux-kernel - [RFC] perf: Reconsider an error code selection in bpf_map_

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Date: Thu, 1 Feb 2024 19:21:53 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: linux-perf-users@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Adrian Hunter <adrian.hunter@...el.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [RFC] perf: Reconsider an error code selection in bpf_map__fprintf()

Hello,

A null pointer check is performed for the input parameter “map”.
It looks suspicious that the function “PTR_ERR” is applied then for
a corresponding return statement.
https://elixir.bootlin.com/linux/v6.8-rc2/source/tools/perf/util/bpf_map.c#L29
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/util/bpf_map.c?h=v6.8-rc2&id=41bccc98fb7931d63d03f326a746ac4d429c1dd3#n29

This issue was detected by using the Coccinelle software.

Would any other error code determination be more appropriate here?

Regards,
Markus