Em Fri, Oct 24, 2014 at 05:36:46PM +0300, Adrian Hunter escreveu:
> On 24/10/2014 4:21 p.m., Arnaldo Carvalho de Melo wrote:
> >Em Fri, Oct 24, 2014 at 10:03:20AM -0300, Arnaldo Carvalho de Melo escreveu:
> >>Em Fri, Oct 24, 2014 at 09:57:02AM -0300, Arnaldo Carvalho de Melo escreveu:
> >>>Em Fri, Oct 24, 2014 at 02:15:52PM +0900, Namhyung Kim escreveu:
> >>>>On Thu, 23 Oct 2014 13:45:10 +0300, Adrian Hunter wrote:
> >>>>>+ if (pmu->selectable) {
> >>>>>+ scnprintf(buf, sizeof(buf), "%s//", pmu->name);
> >>>>>+ aliases[j] = strdup(buf);
> >>>>
> >>>>You need to check the return value here (and above too).
> >>>
> >>>Well spotted, fixing this up.
> >>
> >>Oh well, this print_pmu_events() function needs some care, it starts by
> >>trying to alloc the array, if it fails, it silently returns, does that
> >>mean that there are no pmu events? Or that memory allocation failed?
> >>
> >>Ok, will do the fixes in a separate patch...
> >>
> >>- Arnaldo
> >
> >The patch below should check everything and warn the user, even
> >maintaining that void return...
> >
> >Acked-by tags welcome as always :-)
> >
> >- Arnaldo
> >
> >
> >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 @@ void print_pmu_events(const char *event_glob, bool
> >name_only)
> > if (pmu->selectable)
> > len++;
> > }
> >- aliases = malloc(sizeof(char *) * len);
> >+ aliases = zalloc(sizeof(char *) * len);
> > if (!aliases)
> >- return;
> >+ goto out_enomem;
>
> That path tries to free aliases[j] but aliases is null. You could set len to
> 0 in that case.
Oops, yeah, my bad, it should not have the !, fixing...
> > pmu = NULL;
> > j = 0;
> > while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> >@@ -768,16 +768,20 @@ void print_pmu_events(const char *event_glob, bool
> >name_only)
> > (!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 @@ void print_pmu_events(const char *event_glob, bool
> >name_only)
> > 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)
> >
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