perf pmu: Add proper error handling to print_pmu_events()
It was silently returning or printing "(null)" when no memory was
available at various points. Fix it by checking and warning the user
when that happens.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-835udmf66x9nza504cu6irz9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 91dca60..881b754 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -753,9 +753,9 @@
if (pmu->selectable)
len++;
}
- aliases = malloc(sizeof(char *) * len);
+ aliases = zalloc(sizeof(char *) * len);
if (!aliases)
- return;
+ goto out_enomem;
pmu = NULL;
j = 0;
while ((pmu = perf_pmu__scan(pmu)) != NULL) {
@@ -768,16 +768,20 @@
(!is_cpu && strglobmatch(alias->name,
event_glob))))
continue;
- aliases[j] = name;
+
if (is_cpu && !name_only)
- aliases[j] = format_alias_or(buf, sizeof(buf),
- pmu, alias);
- aliases[j] = strdup(aliases[j]);
+ name = format_alias_or(buf, sizeof(buf), pmu, alias);
+
+ aliases[j] = strdup(name);
+ if (aliases[j] == NULL)
+ goto out_enomem;
j++;
}
if (pmu->selectable) {
- scnprintf(buf, sizeof(buf), "%s//", pmu->name);
- aliases[j] = strdup(buf);
+ char *s;
+ if (asprintf(&s, "%s//", pmu->name) < 0)
+ goto out_enomem;
+ aliases[j] = s;
j++;
}
}
@@ -789,12 +793,20 @@
continue;
}
printf(" %-50s [Kernel PMU event]\n", aliases[j]);
- zfree(&aliases[j]);
printed++;
}
if (printed)
printf("\n");
- free(aliases);
+out_free:
+ for (j = 0; j < len; j++)
+ zfree(&aliases[j]);
+ zfree(&aliases);
+ return;
+
+out_enomem:
+ printf("FATAL: not enough memory to print PMU events\n");
+ if (aliases)
+ goto out_free;
}
bool pmu_have_event(const char *pname, const char *name)