During initialisation in remote_test_load(), if one of the
simple_ring_buffer fails to initialise, the error path attempts to
rollback initialised buffers. However, the rollback incorrectly uses the
global pointer to the trace descriptor, which is only set upon
successful load completion. Fix the error path by using the local
pointer to the descriptor.

Fixes: ea908a2b79c8 ("tracing: Add a trace remote module for testing")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

diff --git a/kernel/trace/remote_test.c b/kernel/trace/remote_test.c
index 6c1b7701ddae..a3e2c9b606eb 100644
--- a/kernel/trace/remote_test.c
+++ b/kernel/trace/remote_test.c
@@ -110,9 +110,9 @@ static struct trace_buffer_desc *remote_test_load(unsigned long size, void *unus
 	return remote_test_buffer_desc;
 
 err_unload:
-	for_each_ring_buffer_desc(rb_desc, cpu, remote_test_buffer_desc)
+	for_each_ring_buffer_desc(rb_desc, cpu, desc)
 		remote_test_unload_simple_rb(rb_desc->cpu);
-	trace_remote_free_buffer(remote_test_buffer_desc);
+	trace_remote_free_buffer(desc);
 
 err_free_desc:
 	kfree(desc);

base-commit: 5d6919055dec134de3c40167a490f33c74c12581
-- 
2.54.0.563.g4f69b47b94-goog