From: Arnaldo Carvalho de Melo <a...@redhat.com> Andi reported problems when parse errors were detected with vendor events (json), because in the yyparse/parse_events_parse function we dereferenced the _data parameter to two different structs, with different layouts, which ended up making parse_events_evlist->error to point to random stack addresses.
Fix it by making _data to always be struct parse_events_state, changing the only place where 'struct parse_events_term' was used in parse_events.y. Reported-by: Andi Kleen <a...@linux.intel.com> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: David Ahern <dsah...@gmail.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Wang Nan <wangn...@huawei.com> Link: http://lkml.kernel.org/n/tip-bc27lshz823hxl8n9nkel...@git.kernel.org Fixes: 90e2b22dee90 ("perf/tool: Add support to reuse event grammar to parse out terms") Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/parse-events.c | 2 +- tools/perf/util/parse-events.h | 5 +---- tools/perf/util/parse-events.y | 2 +- 3 files changed, 3 insertions(+), 6 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 272eab7f5ac8..d4fcf048aa9e 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1656,7 +1656,7 @@ static int parse_events__scanner(const char *str, void *data, int start_token) */ int parse_events_terms(struct list_head *terms, const char *str) { - struct parse_events_terms data = { + struct parse_events_state data = { .terms = NULL, }; int ret; diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 8fff8423469b..2a3617937894 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -114,10 +114,7 @@ struct parse_events_state { int nr_groups; struct parse_events_error *error; struct perf_evlist *evlist; -}; - -struct parse_events_terms { - struct list_head *terms; + struct list_head *terms; }; void parse_events__shrink_config_terms(void); diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 403a221266b8..4b37546e4914 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -488,7 +488,7 @@ opt_event_config: start_terms: event_config { - struct parse_events_terms *data = _data; + struct parse_events_state *data = _data; data->terms = $1; } -- 2.13.5
