Avoid double free by making trace_instance_destroy indempotent.  When
trace_instance_init fails, it calls trace_instance_destroy, but its only
caller osnoise_destroy_tool calls it again.

Fixes: 0605bf009f18 ("rtla: Add osnoise tool")
Signed-off-by: Andreas Schwab <schwab@suse.de>
---
 tools/tracing/rtla/src/trace.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/tracing/rtla/src/trace.c b/tools/tracing/rtla/src/trace.c
index 5784c9f9e570..e1ba6d9f4265 100644
--- a/tools/tracing/rtla/src/trace.c
+++ b/tools/tracing/rtla/src/trace.c
@@ -134,13 +134,18 @@ void trace_instance_destroy(struct trace_instance *trace)
 	if (trace->inst) {
 		disable_tracer(trace->inst);
 		destroy_instance(trace->inst);
+		trace->inst = NULL;
 	}
 
-	if (trace->seq)
+	if (trace->seq) {
 		free(trace->seq);
+		trace->seq = NULL;
+	}
 
-	if (trace->tep)
+	if (trace->tep) {
 		tep_free(trace->tep);
+		trace->tep = NULL;
+	}
 }
 
 /*
-- 
2.37.1


-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

On 7/25/22 17:12, Andreas Schwab wrote:
> Avoid double free by making trace_instance_destroy indempotent.  When
> trace_instance_init fails, it calls trace_instance_destroy, but its only
> caller osnoise_destroy_tool calls it again.
> 
> Fixes: 0605bf009f18 ("rtla: Add osnoise tool")
> Signed-off-by: Andreas Schwab <schwab@suse.de>

Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>

Thanks!
-- Daniel

On Jul 25 2022, Andreas Schwab wrote:

> Avoid double free by making trace_instance_destroy indempotent.  When

s/indempotent/idempotent/

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."