[PATCH v2] tiny-printf: handle NULL pointer for %s format string

[ant . v . moryakov]

From: Anton Moryakov <ant.v.moryakov@xxxxxxxxx>

Avoid NULL pointer dereference in string formatting by printing "(null)"
when a NULL pointer is passed to a %s format specifier.

This change makes the behavior consistent with standard printf()
implementations and prevents potential crashes in constrained environments.

Signed-off-by: Anton Moryakov <ant.v.moryakov@xxxxxxxxx>

---
 lib/tiny-printf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index 2a7a4d286c0..df5f6829db5 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -307,6 +307,8 @@ static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
 				break;
 			case 's':
 				p = va_arg(va, char*);
+				if (!p)
+					p = "(null)";
 				break;
 			case '%':
 				out(info, '%');
-- 
2.34.1