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Date: Mon, 24 Aug 2020 10:30:53 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, Andi Kleen <ak@...ux.intel.com>, Oleg Nesterov <oleg@...hat.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 02/71] perf probe: Fix memory leakage when the probe point is not found From: Masami Hiramatsu <mhiramat@...nel.org> [ Upstream commit 12d572e785b15bc764e956caaa8a4c846fd15694 ] 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") Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org> Reviewed-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com> Cc: Andi Kleen <ak@...ux.intel.com> Cc: Oleg Nesterov <oleg@...hat.com> Cc: stable@...r.kernel.org Link: http://lore.kernel.org/lkml/159438668346.62703.10887420400718492503.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 60169196b9481..4da4ec2552463 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -1351,7 +1351,7 @@ int debuginfo__find_trace_events(struct debuginfo *dbg, tf.ntevs = 0; ret = debuginfo__find_probes(dbg, &tf.pf); - 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); -- 2.25.1
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