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libperf evsel: Open shouldn't leak fd on failure 

If perf_event_open() fails the fd is opened but it is only freed by
closing (not by delete).

Typically when an open fails you don't call close and so this results in
a memory leak. To avoid this, add a close when open fails.

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-By: Kajol Jain <kjain@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220609052355.1300162-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2022-06-08 22:23:52 -07:00 committed by Arnaldo Carvalho de Melo
parent ec906102e5
commit 94725994cf
1 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
tools/lib/perf/evsel.c
View File

@ -149,23 +149,30 @@ int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
int fd, group_fd, *evsel_fd;
evsel_fd = FD(evsel, idx, thread);
if (evsel_fd == NULL)
return -EINVAL;
if (evsel_fd == NULL) {
err = -EINVAL;
goto out;
}
err = get_group_fd(evsel, idx, thread, &group_fd);
if (err < 0)
return err;
goto out;
fd = sys_perf_event_open(&evsel->attr,
threads->map[thread].pid,
cpu, group_fd, 0);
if (fd < 0)
return -errno;
if (fd < 0) {
err = -errno;
goto out;
}
*evsel_fd = fd;
}
}
out:
if (err)
perf_evsel__close(evsel);
return err;
}