From: Kefeng Wang wangkefeng.wang@huawei.com

Remove trace_array 'sample-instance' if kthread_run fails in sample_trace_array_init().

Link: https://lkml.kernel.org/r/20200609135200.2206726-1-wangkefeng.wang@huawei.co...

Cc: stable@vger.kernel.org Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.") Reviewed-by: Divya Indi divya.indi@oracle.com Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org --- samples/ftrace/sample-trace-array.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/samples/ftrace/sample-trace-array.c b/samples/ftrace/sample-trace-array.c index 9e437f930280..6aba02a31c96 100644 --- a/samples/ftrace/sample-trace-array.c +++ b/samples/ftrace/sample-trace-array.c @@ -115,8 +115,12 @@ static int __init sample_trace_array_init(void) trace_printk_init_buffers();

simple_tsk = kthread_run(simple_thread, NULL, "sample-instance"); - if (IS_ERR(simple_tsk)) + if (IS_ERR(simple_tsk)) { + trace_array_put(tr); + trace_array_destroy(tr); return -1; + } + return 0; }