[PATCH] lib: add NULL pointer check for %s format

[ant.v.moryakov at gmail.com]

From: Anton Moryakov <ant.v.moryakov at gmail.com>

Handle NULL pointer case in string formatting (%s) by printing '(null)'
instead of dereferencing NULL pointer. Makes behavior consistent with
standard printf implementations and prevents potential crashes.

Signed-off-by: Anton Moryakov <ant.v.moryakov at gmail.com>"
---
 lib/tiny-printf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index faf55d7f327..da596d72050 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -306,6 +306,8 @@ 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, '%');
-- 
2.30.2