From 47312797e2e7f523fbb954244e85d19b67cf4b21 Mon Sep 17 00:00:00 2001
From: Wolfvak <soherrera1@hotmail.com>
Date: Sun, 29 Sep 2019 15:57:03 -0300
Subject: [PATCH] Partially fix #537

if size was zero, the inputstr array could contain stack garbage
---
 arm9/source/common/ui.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arm9/source/common/ui.c b/arm9/source/common/ui.c
index a439085..078f821 100644
--- a/arm9/source/common/ui.c
+++ b/arm9/source/common/ui.c
@@ -920,7 +920,9 @@ bool ShowDataPrompt(u8* data, u32* size, const char *format, ...) {
     bool ret = false;
     va_list va;
 
-    if (*size > 64) *size = 64;
+    if (*size == 0) *inputstr = 0;
+    else if (*size > 64) *size = 64;
+
     for (u32 i = 0; i < *size; i++)
         snprintf(inputstr + (2*i), 128 + 1 - (2*i), "%02X", (unsigned int) data[i]);