tools/latency-collector: Use correct size when writing queue_full_warning

[ Upstream commit f604de20c0a47e0e9518940a1810193678c92fa8 ]

queue_full_warning is a pointer, so it is wrong to use sizeof to calculate
the number of characters of the string it points to. The effect is that we
only print out the first few characters of the warning string.

The correct way is to use strlen(). We don't need to add 1 to the strlen()
because we don't want to write the terminating null character to stdout.

Link: https://lkml.kernel.org/r/20211019160701.15587-1-Viktor.Rosendahl@bmw.de
Link: https://lore.kernel.org/r/8fd4bb65ef3da67feac9ce3258cdbe9824752cf1.1629198502.git.jing.yangyang@zte.com.cn
Link: https://lore.kernel.org/r/20211012025424.180781-1-davidcomponentone@gmail.com
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Viktor Rosendahl <Viktor.Rosendahl@bmw.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/tracing/latency/latency-collector.c b/tools/tracing/latency/latency-collector.c
index 3a2e6bb781a8c823b887120b06af712b071e426e..59a7f2346eab487f5b4a662c9ea04a36eb385e7a 100644 (file)
--- a/tools/tracing/latency/latency-collector.c
+++ b/tools/tracing/latency/latency-collector.c
@@ -1538,7 +1538,7 @@ static void tracing_loop(void)
                                mutex_lock(&print_mtx);
                                check_signals();
                                write_or_die(fd_stdout, queue_full_warning,
-                                            sizeof(queue_full_warning));
+                                            strlen(queue_full_warning));
                                mutex_unlock(&print_mtx);
                        }
                        modified--;