From e43cb595915c49b65cf352753d76086c9e149e43 Mon Sep 17 00:00:00 2001
From: Viktor Rosendahl <Viktor.Rosendahl@bmw.de>
Date: Tue, 19 Oct 2021 18:07:01 +0200
Subject: [PATCH] tools/latency-collector: Use correct size when writing queue_full_warning
Git-commit: f604de20c0a47e0e9518940a1810193678c92fa8
Patch-mainline: v5.16-rc1
References: stable-5.14.19

[ 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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 tools/tracing/latency/latency-collector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/tracing/latency/latency-collector.c b/tools/tracing/latency/latency-collector.c
index 3a2e6bb781a8..59a7f2346eab 100644
--- 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--;
-- 
2.26.2