From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13F17C48BD6 for ; Thu, 27 Jun 2019 15:35:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D74DB2147A for ; Thu, 27 Jun 2019 15:35:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561649756; bh=w9vijaW26Z8Lx6wXk5dG9FHIZhox0SiapEkZxWNw8UM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:List-ID:From; b=hx9EB5oP6v3hJuqUr1I90Uvzx6rL6+kKKO0GcYZAszLpQyn+YUEAYUxQfXJgj27O6 RWOAL5YdsICnqF5ptsvr0QJq7L/0mijjCp415vUARzcPOG0rr0AduK8QeomQiefMB6 ewFG3YzGmDjCX40iuhDVqM/SMX2cF1RfYON1h+zU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726752AbfF0Pfz (ORCPT ); Thu, 27 Jun 2019 11:35:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:43576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726565AbfF0Pfq (ORCPT ); Thu, 27 Jun 2019 11:35:46 -0400 Received: from localhost.localdomain (c-98-220-238-81.hsd1.il.comcast.net [98.220.238.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3EAEF20659; Thu, 27 Jun 2019 15:35:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561649745; bh=w9vijaW26Z8Lx6wXk5dG9FHIZhox0SiapEkZxWNw8UM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=x2H70Hj2BeB02aAJlMT4lXSlYa7zFXq3u3JFoLPqup0Y+XY2GPe+kWOR5zjKaxlYp 9AXYg3rixITySpvOpOYOdRidhOqWPkSPWGl3+w88OnLPyGsDD5coXaxlWgBGRYCmU/ cDVT53Duzifk3UmTR5ihzhmyoRXdKunb97cpog4U= From: Tom Zanussi To: rostedt@goodmis.org Cc: mhiramat@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/4] tracing: Simplify assignment parsing for hist triggers Date: Thu, 27 Jun 2019 10:35:16 -0500 Message-Id: <17ac912dcec67c85e371b47dd2f55ae7c082b5f6.1561647046.git.zanussi@kernel.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the process of adding better error messages for sorting, I realized that strsep was being used incorrectly and some of the error paths I was expecting to be hit weren't and just fell through to the common invalid key error case. It also became obvious that for keyword assignments, it wasn't necessary to save the full assignment and reparse it later, and having a common empty-assignment check would also make more sense in terms of error processing. Change the code to fix these problems and simplify it for new error message changes in a subsequent patch. Signed-off-by: Tom Zanussi --- kernel/trace/trace_events_hist.c | 70 ++++++++++++++++------------------------ 1 file changed, 27 insertions(+), 43 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index ca6b0dff60c5..964d032f51c6 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1985,12 +1985,6 @@ static int parse_map_size(char *str) unsigned long size, map_bits; int ret; - strsep(&str, "="); - if (!str) { - ret = -EINVAL; - goto out; - } - ret = kstrtoul(str, 0, &size); if (ret) goto out; @@ -2050,25 +2044,25 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs) static int parse_assignment(struct trace_array *tr, char *str, struct hist_trigger_attrs *attrs) { - int ret = 0; + int len, ret = 0; - if ((str_has_prefix(str, "key=")) || - (str_has_prefix(str, "keys="))) { - attrs->keys_str = kstrdup(str, GFP_KERNEL); + if ((len = str_has_prefix(str, "key=")) || + (len = str_has_prefix(str, "keys="))) { + attrs->keys_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->keys_str) { ret = -ENOMEM; goto out; } - } else if ((str_has_prefix(str, "val=")) || - (str_has_prefix(str, "vals=")) || - (str_has_prefix(str, "values="))) { - attrs->vals_str = kstrdup(str, GFP_KERNEL); + } else if ((len = str_has_prefix(str, "val=")) || + (len = str_has_prefix(str, "vals=")) || + (len = str_has_prefix(str, "values="))) { + attrs->vals_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->vals_str) { ret = -ENOMEM; goto out; } - } else if (str_has_prefix(str, "sort=")) { - attrs->sort_key_str = kstrdup(str, GFP_KERNEL); + } else if ((len = str_has_prefix(str, "sort="))) { + attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL); if (!attrs->sort_key_str) { ret = -ENOMEM; goto out; @@ -2079,12 +2073,8 @@ static int parse_assignment(struct trace_array *tr, ret = -ENOMEM; goto out; } - } else if (str_has_prefix(str, "clock=")) { - strsep(&str, "="); - if (!str) { - ret = -EINVAL; - goto out; - } + } else if ((len = str_has_prefix(str, "clock="))) { + str += len; str = strstrip(str); attrs->clock = kstrdup(str, GFP_KERNEL); @@ -2092,8 +2082,8 @@ static int parse_assignment(struct trace_array *tr, ret = -ENOMEM; goto out; } - } else if (str_has_prefix(str, "size=")) { - int map_bits = parse_map_size(str); + } else if ((len = str_has_prefix(str, "size="))) { + int map_bits = parse_map_size(str + len); if (map_bits < 0) { ret = map_bits; @@ -2133,8 +2123,14 @@ parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str) while (trigger_str) { char *str = strsep(&trigger_str, ":"); + char *rhs; - if (strchr(str, '=')) { + rhs = strchr(str, '='); + if (rhs) { + if (!strlen(++rhs)) { + ret = -EINVAL; + goto free; + } ret = parse_assignment(tr, str, attrs); if (ret) goto free; @@ -4459,10 +4455,6 @@ static int create_val_fields(struct hist_trigger_data *hist_data, if (!fields_str) goto out; - strsep(&fields_str, "="); - if (!fields_str) - goto out; - for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && j < TRACING_MAP_VALS_MAX; i++) { field_str = strsep(&fields_str, ","); @@ -4557,10 +4549,6 @@ static int create_key_fields(struct hist_trigger_data *hist_data, if (!fields_str) goto out; - strsep(&fields_str, "="); - if (!fields_str) - goto out; - for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { field_str = strsep(&fields_str, ","); if (!field_str) @@ -4718,12 +4706,6 @@ static int create_sort_keys(struct hist_trigger_data *hist_data) if (!fields_str) goto out; - strsep(&fields_str, "="); - if (!fields_str) { - ret = -EINVAL; - goto out; - } - for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { struct hist_field *hist_field; char *field_str, *field_name; @@ -4732,9 +4714,11 @@ static int create_sort_keys(struct hist_trigger_data *hist_data) sort_key = &hist_data->sort_keys[i]; field_str = strsep(&fields_str, ","); - if (!field_str) { - if (i == 0) - ret = -EINVAL; + if (!field_str) + break; + + if (!*field_str) { + ret = -EINVAL; break; } @@ -4744,7 +4728,7 @@ static int create_sort_keys(struct hist_trigger_data *hist_data) } field_name = strsep(&field_str, "."); - if (!field_name) { + if (!field_name || !*field_name) { ret = -EINVAL; break; } -- 2.14.1