3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: Arnaldo Carvalho de Melo acme@redhat.com
commit d17d0878f456c8227345b6c76b918ec068fa0abd upstream.
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 ak@linux.intel.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: David Ahern dsahern@gmail.com Cc: Jiri Olsa jolsa@kernel.org Cc: Namhyung Kim namhyung@kernel.org Cc: Wang Nan wangnan0@huawei.com Link: http://lkml.kernel.org/n/tip-bc27lshz823hxl8n9nkelcgh@git.kernel.org Fixes: 90e2b22dee90 ("perf/tool: Add support to reuse event grammar to parse out terms") Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- 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(-)
--- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -908,7 +908,7 @@ static int parse_events__scanner(const c */ 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; --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -65,10 +65,7 @@ struct parse_events_state { struct list_head list; int idx; int nr_groups; -}; - -struct parse_events_terms { - struct list_head *terms; + struct list_head *terms; };
int parse_events__is_hardcoded_term(struct parse_events_term *term); --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -346,7 +346,7 @@ PE_RAW
start_terms: event_config { - struct parse_events_terms *data = _data; + struct parse_events_state *data = _data; data->terms = $1; }