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From: Ian Lepore <ian@FreeBSD.org>
Date: Tue, 17 Mar 2015 20:56:24 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r280192 - head/sys/kern
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Author: ian
Date: Tue Mar 17 20:56:24 2015
New Revision: 280192
URL: https://svnweb.freebsd.org/changeset/base/280192

Log:
  In sbuf_new_for_sysctl(), default the buffer size to 64 bytes if the
  passed-in pointer is NULL and the length is zero.

Modified:
  head/sys/kern/kern_sysctl.c

Modified: head/sys/kern/kern_sysctl.c
==============================================================================
--- head/sys/kern/kern_sysctl.c	Tue Mar 17 20:15:49 2015	(r280191)
+++ head/sys/kern/kern_sysctl.c	Tue Mar 17 20:56:24 2015	(r280192)
@@ -1807,6 +1807,9 @@ sbuf_new_for_sysctl(struct sbuf *s, char
     struct sysctl_req *req)
 {
 
+	/* Supply a default buffer size if none given. */
+	if (buf == NULL && length == 0)
+		length = 64;
 	s = sbuf_new(s, buf, length, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
 	sbuf_set_drain(s, sbuf_sysctl_drain, req);
 	return (s);