[PATCH v3] tracing: Replace deprecated strncpy() with strscpy() for stack_trace_filter_buf

[Devaansh Kumar]

strncpy() is deprecated for NUL-terminated destination buffers and must
be replaced by strscpy().

See issue: https://github.com/KSPP/linux/issues/90

Signed-off-by: Devaansh Kumar <devaanshk840@xxxxxxxxx>
---
 kernel/trace/trace_stack.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 5a48dba912ea..91ed2b76fa4c 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -543,8 +543,10 @@ static __init int enable_stacktrace(char *str)
 {
 	int len;
 
-	if ((len = str_has_prefix(str, "_filter=")))
-		strncpy(stack_trace_filter_buf, str + len, COMMAND_LINE_SIZE);
+	len = str_has_prefix(str, "_filter=");
+
+	if (len)
+		strscpy(stack_trace_filter_buf, str + len, sizeof(stack_trace_filter_buf));
 
 	stack_tracer_enabled = 1;
 	return 1;
-- 
2.47.1