From 4b43b375b7abae22070cd86bfc26a8222233150e Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Wed, 31 Jan 2024 13:24:56 -0500
Subject: check for overlapping pointers

---
 src/stdio/vsnprintf.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/stdio/vsnprintf.c')

diff --git a/src/stdio/vsnprintf.c b/src/stdio/vsnprintf.c
index 3fa18cf4..87deb169 100644
--- a/src/stdio/vsnprintf.c
+++ b/src/stdio/vsnprintf.c
@@ -1,10 +1,13 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <string.h>
 #include "_stdio.h"
 
 int vsnprintf(char * restrict s, size_t n, const char *format, va_list arg)
 {
 	SIGNAL_SAFE(0);
+	ASSERT_NOOVERLAP(s, n, format, strlen(format));
+
 	struct io_options opt = {
 		.fnname = __func__,
 		.string = s,
-- 
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