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 198D43D25AF; Fri, 12 Jun 2026 22:24:46 +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=1781303088; cv=none; b=ZkcHFPTKqtmSZRmLvzBaf+qblMylaDOQyWgxLY1JoEnE42nORG9X6yBMHycTyK+GiF3307KZekdelFg/my9Xch/Ezdi4qKqWUrRsNJqOxYtPDrSq6AG9sWfxrHxAcXknWBS1srbOz9YsBdDO/tZRuC83auaGzAnyECKoByF20Bw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781303088; c=relaxed/simple; bh=GPQL6kuquXgSoupC/MydkLZ8edpQzukBi1PwfjKRsA4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hM0RINlB2rjrA6xTR0e+yw2gpFkPtY3OdplUxrmJWIr4Evq9wEFhWiHzjzjMn8q/aEVFW4cpMc3Iw1yjLTMBbvCdDLcu603oaAJMv8aXQItmKCh6Go1Mlq2QDt3E/+tTmRFPpZ4ViV+ILgAYD0XP9kUMrFxOWbsJjqIUr2tPi7w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BgkbPfkI; 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="BgkbPfkI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7906B1F00A3A; Fri, 12 Jun 2026 22:24:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781303086; bh=5+8eGUHAU69i6rx7CDdOyZKaiIeecP1hshyCWJgUUbs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BgkbPfkIn5/rSosGlNpLikt0PLgioqN0VRLtFG5iSMJkM7hfPQVux6BJWIxy191da VUcIcjVNvmlCuNQ7iieXmiYuXA+mp/EOsbykuF7fWJceira7mKU9bifNO1xzt/xDct kHK+nrR+r9D5I4PGb8b04Sqno8pICl0bINN+zLehy0321CoHpFcwAVBfsOmwG9Vu64 f+3liObBCknqksUx4Tu2SM4B3zcxAR8BcV30TgR0SdYY00/vxyL278dNdkbhecP0e6 +bYyepijDaJBZWkE1HGrSNq6gIC3pVkVOOskCJeh27HSNVLJV57uIYx4KcALiiMseV SHew6A9Nuibsw== 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 , sashiko-bot , "Claude Opus 4.6" Subject: [PATCH 07/13] perf hwmon: Fix fd check to accept fd 0 in hwmon_pmu__describe_items() Date: Fri, 12 Jun 2026 19:24:06 -0300 Message-ID: <20260612222413.40791-8-acme@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260612222413.40791-1-acme@kernel.org> References: <20260612222413.40791-1-acme@kernel.org> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnaldo Carvalho de Melo hwmon_pmu__describe_items() checks 'if (fd > 0)' after openat(), which incorrectly rejects fd 0. While fd 0 is normally stdin, if stdin has been closed (common in daemon/service contexts), the kernel reuses fd 0 for the next open. With fd > 0, the sysfs file is not read and the fd is leaked. Change to 'if (fd >= 0)' to match the standard openat() error check. Reported-by: sashiko-bot Fixes: 53cc0b351ec99278 ("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs") Cc: Ian Rogers Assisted-by: Claude Opus 4.6 Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/hwmon_pmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/hwmon_pmu.c b/tools/perf/util/hwmon_pmu.c index efd3067a2e591050..ed544dca70c380b2 100644 --- a/tools/perf/util/hwmon_pmu.c +++ b/tools/perf/util/hwmon_pmu.c @@ -435,7 +435,7 @@ static size_t hwmon_pmu__describe_items(struct hwmon_pmu *hwm, char *out_buf, si hwmon_item_strs[bit], is_alarm ? "_alarm" : ""); fd = openat(dir, buf, O_RDONLY); - if (fd > 0) { + if (fd >= 0) { ssize_t read_len = read(fd, buf, sizeof(buf) - 1); while (read_len > 0 && buf[read_len - 1] == '\n') -- 2.54.0