[PATCH 3/5] perf tools: Fix parse_events_error dereferences

From: Adrian Hunter
Date: Tue May 19 2015 - 09:08:18 EST


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@xxxxxxxxx>
---
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

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