From 22adaea1ee87bee503123b014adb729e6ad669ae Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Mon, 27 Nov 2017 09:57:37 +0000
Subject: [PATCH] Truncate negative lengths to zero

---
 lib/libc/stdio/xprintf_hexdump.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/libc/stdio/xprintf_hexdump.c b/lib/libc/stdio/xprintf_hexdump.c
index 73f98a8fb53f..0b7dfb3ff221 100644
--- a/lib/libc/stdio/xprintf_hexdump.c
+++ b/lib/libc/stdio/xprintf_hexdump.c
@@ -50,6 +50,7 @@ int
 __printf_render_hexdump(struct __printf_io *io, const struct printf_info *pi, const void *const *arg)
 {
 	unsigned char *p;
+	int i;
 	unsigned u, l, j, a;
 	char buf[100], *q;
 	int ret;
@@ -59,7 +60,10 @@ __printf_render_hexdump(struct __printf_io *io, const struct printf_info *pi, co
 	else
 		l = 16;
 	p = *((unsigned char **)arg[0]);
-	u = *((unsigned *)arg[1]);
+	i = *((int *)arg[1]);
+	if (i < 0)
+		i = 0;
+	u = i;
 
 	ret = 0;
 	a = 0;