rp6502 validate write_xstack count

2024-01-30 00:17:28 -08:00
parent dd95d20268
commit 9ffa2d05e6
2 changed files with 5 additions and 2 deletions
--- a/libsrc/rp6502/write_xstack.c
+++ b/libsrc/rp6502/write_xstack.c
@@ -1,8 +1,12 @@
 #include <rp6502.h>
+#include <errno.h>

 int __fastcall__ write_xstack (const void* buf, unsigned count, int fildes)
 {
    unsigned i;
+    if (count > 256) {
+        return _mappederrno (EINVAL);
+    }
    for (i = count; i;) {
        ria_push_char (((char*)buf)[--i]);
    }