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 1C0B633F8A2; Sat, 30 May 2026 18:05:14 +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=1780164315; cv=none; b=cwDBb/IO2IcSDf+kRVU3XFEbfE1wQQEQAScUGiQ/iWChlcRcEyl6OVsrrbbkExfwIfU+QvW7F5qwwkTFOBnlINGeA0AobJCkkzZhVZNZQ2EA9wRcUt1iL0dOYZhKNFIrPdnDlju+BE+abOUtX2e8nXxGPaE/LV7D5y7c0J8OCqg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780164315; c=relaxed/simple; bh=YxlL8uMfi2qWFn6N1eoqR7f4mshKJLaklP+U8ePg8mI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t1Cek9sfjhiWmUOj7fxxO6uGSyaOVbEflpov4xUR90GsSDRqiwmYVolH7OZubBbGHlTxwt37+EThAv0SBBgG6sVbMySK+r0utvH6dtwxM8XMNaMLz8AndlxEPrUjd8Qtr+WpNjAqi8W2RFWGbnaTOi5shyHPewNrUMgh9Ac+oPE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ntSRl+09; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ntSRl+09" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A6811F00893; Sat, 30 May 2026 18:05:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780164314; bh=z1W+Cplh9r2Nct2JmARiY+pkKChDwN1pkk0yayowh6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ntSRl+09kzEaXpe1O/90Q+rDyIoM5eH8OojmVmH+Hpodg7ElGHxBow0PpvQQ8koQ0 osQEzNcW7RkF17LozUmeCC/ysp3J1IUibA8E6xfv3gxBLix2APcRryEjeXZ0c+jc8Z uVVmDkE8WQdoHMj1TiiaCKiBD/WgndXGmRW/JCPY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Leo Yan , Ian Rogers , Namhyung Kim , Sasha Levin Subject: [PATCH 5.15 517/776] perf expr: Return -EINVAL for syntax error in expr__find_ids() Date: Sat, 30 May 2026 18:03:51 +0200 Message-ID: <20260530160253.605482941@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leo Yan [ Upstream commit 3a61fd866ef9aaa1d3158b460f852b74a2df07f4 ] expr__find_ids() propagates the parser return value directly. For syntax errors, the parser can return a positive value, but callers treat it as success, e.g., for below case on Arm64 platform: metric expr 100 * (STALL_SLOT_BACKEND / (CPU_CYCLES * #slots) - BR_MIS_PRED * 3 / CPU_CYCLES) for backend_bound parsing metric: 100 * (STALL_SLOT_BACKEND / (CPU_CYCLES * #slots) - BR_MIS_PRED * 3 / CPU_CYCLES) Failure to read '#slots' literal: #slots = nan syntax error Convert positive parser returns in expr__find_ids() to -EINVAL, as a result, the error value will be respected by callers. Before: perf stat -C 5 Failure to read '#slots'Failure to read '#slots'Failure to read '#slots'Failure to read '#slots'Segmentation fault After: perf stat -C 5 Failure to read '#slots'Cannot find metric or group `Default' Fixes: ded80bda8bc9 ("perf expr: Migrate expr ids table to a hashmap") Signed-off-by: Leo Yan Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin --- tools/perf/util/expr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c index a850fd0be3ee2..45e54c1caa724 100644 --- a/tools/perf/util/expr.c +++ b/tools/perf/util/expr.c @@ -275,7 +275,8 @@ int expr__find_other(const char *expr, const char *one, if (one) expr__del_id(ctx, one); - return ret; + /* A positive value means syntax error, convert to -EINVAL */ + return ret > 0 ? -EINVAL : ret; } double expr_id_data__value(const struct expr_id_data *data) -- 2.53.0