From 0c2e89c50542aa374d776ce0787b4a06e0de1be2 Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Fri, 2 Oct 2015 09:23:14 +0000
Subject: Fail the sbuf if vsnprintf(3) fails.

---
 sys/kern/subr_sbuf.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'sys/kern/subr_sbuf.c')

diff --git a/sys/kern/subr_sbuf.c b/sys/kern/subr_sbuf.c
index 3c36b28..5314590 100644
--- a/sys/kern/subr_sbuf.c
+++ b/sys/kern/subr_sbuf.c
@@ -623,6 +623,10 @@ sbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap)
 		va_copy(ap_copy, ap);
 		len = vsnprintf(&s->s_buf[s->s_len], SBUF_FREESPACE(s) + 1,
 		    fmt, ap_copy);
+		if (len < 0) {
+			s->s_error = errno;
+			return (-1);
+		}
 		va_end(ap_copy);
 
 		if (SBUF_FREESPACE(s) >= len)
-- 
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