linux-kernel - [PATCH 3/5] perf tools: Fix parse_events

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 19 May 2015 16:05:44 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>
Subject: [PATCH 3/5] perf tools: Fix parse_events_error dereferences

Parse errors can be reported in struct parse_events_error
but the pointer passed is optional and can be NULL.
Ensure it is not NULL before dereferencing it.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/parse-events.c | 2 ++
 tools/perf/util/parse-events.y | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 78032d8..2a4d1ec 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1659,6 +1659,8 @@ void parse_events_evlist_error(struct parse_events_evlist *data,
 {
 	struct parse_events_error *err = data->error;
 
+	if (!err)
+		return;
 	err->idx = idx;
 	err->str = strdup(str);
 	WARN_ONCE(!err->str, "WARNING: failed to allocate error string");
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 3d11e00..591905a 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -389,8 +389,10 @@ PE_NAME ':' PE_NAME
 	if (parse_events_add_tracepoint(list, &data->idx, $1, $3)) {
 		struct parse_events_error *error = data->error;
 
-		error->idx = @1.first_column;
-		error->str = strdup("unknown tracepoint");
+		if (error) {
+			error->idx = @1.first_column;
+			error->str = strdup("unknown tracepoint");
+		}
 		return -1;
 	}
 	$$ = list;
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/