* Masami Hiramatsu <mhira...@kernel.org> [2020-07-09 17:07:22]:
> Fix the memory leakage in debuginfo__find_trace_events() when the probe
> point is not found in the debuginfo. If there is no probe point found in
> the debuginfo, debuginfo__find_probes() will NOT return -ENOENT, but 0.
> Thus the caller of debuginfo__find_probes() must check the tf.ntevs and
> release the allocated memory for the array of struct probe_trace_event.
>
> The current code releases the memory only if the debuginfo__find_probes()
> hits an error but not checks tf.ntevs. In the result, the memory allocated
> on *tevs are not released if tf.ntevs == 0.
>
> This fixes the memory leakage by checking tf.ntevs == 0 in addition to
> ret < 0.
>
> Fixes: ff741783506c ("perf probe: Introduce debuginfo to encapsulate dwarf
> information")
> Cc: sta...@vger.kernel.org
> Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
Looks good to me.
Reviewed-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
> ---
> tools/perf/util/probe-finder.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 9963e4e8ea20..659024342e9a 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -1467,7 +1467,7 @@ int debuginfo__find_trace_events(struct debuginfo *dbg,
> if (ret >= 0 && tf.pf.skip_empty_arg)
> ret = fill_empty_trace_arg(pev, tf.tevs, tf.ntevs);
>
> - if (ret < 0) {
> + if (ret < 0 || tf.ntevs == 0) {
> for (i = 0; i < tf.ntevs; i++)
> clear_probe_trace_event(&tf.tevs[i]);
> zfree(tevs);
>
--
Thanks and Regards
Srikar Dronamraju
