From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8094842122F; Thu, 1 Oct 2026 18:54:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790880857; cv=none; b=gW8QMCFdYt6uRePnKm71Q7+1zxw8vwkNFus0vMQRQ3sbVqh5fBU8rgiVNFUAlqCLK+oRJIVCJQUdlrNK7COx6D1N/OFvqwf25YdcreJWTF5WOguDUSUQJOEB5nzt9VTBrjcyJWHKoZqCZO6RoEPX/JWigwbMLExOtFvALcegbVo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790880857; c=relaxed/simple; bh=xnJ0E046ME8LTvEUrOdXxLjWWji+HEg+GCi03JsverE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JTqs+LwmmL1AJDOPF2aoUsJ+GSALlHFy6yfOaXfnVF8DJMzYWNJkRE6lSB/sqDwQCgaC/wcT7XPKZULyET3VDHWAGIV55Ij+U3MrzTKFNj7DrL7Z2LHgc6PqFRh07VkDfkm2rYHZfOFohVyLkhNUJsn+NrzS/LEM9GByIggSoQU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e9NHOFCD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="e9NHOFCD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10E881F000FF; Thu, 1 Oct 2026 18:54:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790880856; bh=GsRS+8QUyzXT3sy05mzdqRSQVHQwC0/XHLNHgHoSuiM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=e9NHOFCDv2lFtcoVHguSDY8o+/kU91Ua7BNoCcDrpmZCzWy3lwFnn9Zs7shl4W7dV 27SgIZ3la5atbrFcHxTvk9AO0w6tLFI548BqlRpzuMkVIYwCMguJ6BXLk5Bb5hZ8op pT+D21vOBGWeVVgCDOVwMv2B/o2U29DF9gOKPMnZG2aNOGdzQV+8c16jVMJYuKsFYY 1Oh/a1+QvHv5LK9Q0kywRHXadWo3Pqg8Cx/wRHwrPttzRULoTGKxdesrhf93Fo8Le9 5yJWoGF8ZkVjhNc5W1vdOj64sds+cfRS7Nf1N6p3dwYqAH3V7bGKrczfGc2PFjZkjY 3MR/Vtv1vXu5g== From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH v7 2/9] perf config: Make perf_etc_perfconfig() never return NULL Date: Thu, 1 Oct 2026 20:53:53 +0200 Message-ID: <20261001185400.2754753-3-acme@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261001185400.2754753-1-acme@kernel.org> References: <20261001185400.2754753-1-acme@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnaldo Carvalho de Melo perf_etc_perfconfig() returns what system_path() gives, and that allocates, so on failure every caller dereferenced NULL, the pre-existing ones in perf_config_set__init() and in the daemon included. For the usual absolute ETC_PERFCONFIG system_path() just returns a strdup of it, so use ETC_PERFCONFIG itself when that fails. Assisted-by: LLM Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/config.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c index 85e50d0a25580da0..6e0ff8a9140ccf96 100644 --- a/tools/perf/util/config.c +++ b/tools/perf/util/config.c @@ -571,8 +571,14 @@ static int perf_config_from_file(config_fn_t fn, const char *filename, void *dat const char *perf_etc_perfconfig(void) { static const char *system_wide; + if (!system_wide) - system_wide = system_path(ETC_PERFCONFIG); + /* + * ETC_PERFCONFIG is absolute, so its unresolved path is + * the same string, better than the callers crashing. + */ + system_wide = system_path(ETC_PERFCONFIG) ?: ETC_PERFCONFIG; + return system_wide; } -- 2.55.0