From: Arnaldo Carvalho de Melo acme@redhat.com
[ Upstream commit 7fcdccd4237724931d9773d1e3039bfe053a6f52 ]
When applying a patch by Ian I incorrectly converted to zfree() an expression that involved testing some other struct member, not the one being freed, which lead to bugs reproduceable by:
$ perf stat -e i/bs,tsc,L2/o sleep 1 WARNING: multiple event parsing errors Segmentation fault (core dumped) $
Fix it by restoring the test for pos->free_str before freeing pos->val.str, but continue using zfree(&pos->val.str) to set that member to NULL after freeing it.
Reported-by: Ian Rogers irogers@google.com Fixes: e8dfb81838b1 ("perf parse-events: Fix memory leaks found on parse_events") Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andi Kleen ak@linux.intel.com Cc: clang-built-linux@googlegroups.com Cc: Jiri Olsa jolsa@kernel.org Cc: Leo Yan leo.yan@linaro.org Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Stephane Eranian eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/parse-events.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 2733cdfdf04c6..ba973bdfaa657 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -1258,7 +1258,8 @@ static int __parse_events_add_pmu(struct parse_events_state *parse_state,
list_for_each_entry_safe(pos, tmp, &config_terms, list) { list_del_init(&pos->list); - zfree(&pos->val.str); + if (pos->free_str) + zfree(&pos->val.str); free(pos); } return -EINVAL;