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From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org, namhyung@kernel.org
Subject: [PATCH v2 4/8] trace-cmd libtraceevent: Improve error handling of tep_plugin_add_option() API
Date: Wed, 15 Jul 2020 05:30:05 +0300
Message-ID: <20200715023009.2503879-5-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20200715023009.2503879-1-tz.stoyanov@gmail.com>

In case of memory error, ensure all allocated resources are freed.
Do not append broken option in trace_plugin_options list.

Link: https://lore.kernel.org/linux-trace-devel/CAM9d7cizjF+fbK7YzmsBDgrx__4YAOsmEq67D3sWET8FF+YdFA@mail.gmail.com/T/#u
Suggested-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 lib/traceevent/event-plugin.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/lib/traceevent/event-plugin.c b/lib/traceevent/event-plugin.c
index 03f26c8c..aa868133 100644
--- a/lib/traceevent/event-plugin.c
+++ b/lib/traceevent/event-plugin.c
@@ -361,23 +361,25 @@ int tep_plugin_add_option(const char *name, const char *val)
 	if (!op) {
 		op = malloc(sizeof(*op));
 		if (!op)
-			return -ENOMEM;
+			goto out_free;
 		memset(op, 0, sizeof(*op));
-		op->next = trace_plugin_options;
-		trace_plugin_options = op;
-
 		op->plugin = plugin;
 		op->option = option_str;
-
 		if (val) {
 			op->value = strdup(val);
-			if (!op->value)
+			if (!op->value) {
+				free(op);
 				goto out_free;
+			}
 		}
+		op->next = trace_plugin_options;
+		trace_plugin_options = op;
 	}
 
 	return process_option(plugin, option_str, val);
- out_free:
+
+out_free:
+	free(plugin);
 	free(option_str);
 	return -ENOMEM;
 }
-- 
2.26.2


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  2:30 [PATCH v2 0/8] Few libtraceeevnt fixes, suggested Namhyung Kim Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 1/8] trace-cmd libtraceevent: Document tep_load_plugins_hook() Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 2/8] trace-cmd libtraceevent: Handle strdup() error in parse_option_name() Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 3/8] trace-cmd libtraceevent: Fix typo in tep_plugin_add_option() description Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` Tzvetomir Stoyanov (VMware) [this message]
2020-07-15  2:30 ` [PATCH v2 5/8] trace-cmd libtraceevent: Fix broken indentation in parse_ip4_print_args() Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 6/8] trace-cmd libtraceevent: Fix type in PRINT_FMT_STING Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 7/8] trace-cmd libtraceevent: Fix description of tep_add_plugin_path() API Tzvetomir Stoyanov (VMware)
2020-07-15  2:30 ` [PATCH v2 8/8] trace-cmd libtraceevent: Handle possible strdup() error in " Tzvetomir Stoyanov (VMware)
2020-07-15  2:36 ` [PATCH v2 0/8] Few libtraceeevnt fixes, suggested Namhyung Kim Steven Rostedt
2020-07-15  4:12   ` Tzvetomir Stoyanov

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