From: phk <phk@FreeBSD.org>
Date: Fri, 2 Oct 2015 09:23:14 +0000 (+0000)
Subject: Fail the sbuf if vsnprintf(3) fails.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=0c2e89c50542aa374d776ce0787b4a06e0de1be2;p=people%2Fjulieng%2Ffreebsd.git

Fail the sbuf if vsnprintf(3) fails.
---

diff --git a/sys/kern/subr_sbuf.c b/sys/kern/subr_sbuf.c
index 3c36b28628ef..5314590bce26 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)