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From: Andriy Gapon <avg@FreeBSD.org>
Date: Thu, 16 Nov 2017 22:47:41 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r325910 -
 stable/10/sys/cddl/contrib/opensolaris/common/zfs
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Author: avg
Date: Thu Nov 16 22:47:41 2017
New Revision: 325910
URL: https://svnweb.freebsd.org/changeset/base/325910

Log:
  MFC r325606: MFV r325605: 8713 Buffer overflow in dsl_dataset_name()

Modified:
  stable/10/sys/cddl/contrib/opensolaris/common/zfs/zfs_namecheck.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/cddl/contrib/opensolaris/common/zfs/zfs_namecheck.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/common/zfs/zfs_namecheck.c	Thu Nov 16 22:44:51 2017	(r325909)
+++ stable/10/sys/cddl/contrib/opensolaris/common/zfs/zfs_namecheck.c	Thu Nov 16 22:47:41 2017	(r325910)
@@ -44,6 +44,7 @@
 #include <string.h>
 #endif
 
+#include <sys/dsl_dir.h>
 #include <sys/param.h>
 #include <sys/nvpair.h>
 #include "zfs_namecheck.h"
@@ -296,8 +297,14 @@ pool_namecheck(const char *pool, namecheck_err_t *why,
 
 	/*
 	 * Make sure the name is not too long.
+	 * If we're creating a pool with version >= SPA_VERSION_DSL_SCRUB (v11)
+	 * we need to account for additional space needed by the origin ds which
+	 * will also be snapshotted: "poolname"+"/"+"$ORIGIN"+"@"+"$ORIGIN".
+	 * Play it safe and enforce this limit even if the pool version is < 11
+	 * so it can be upgraded without issues.
 	 */
-	if (strlen(pool) >= ZFS_MAX_DATASET_NAME_LEN) {
+	if (strlen(pool) >= (ZFS_MAX_DATASET_NAME_LEN - 2 -
+	    strlen(ORIGIN_DIR_NAME) * 2)) {
 		if (why)
 			*why = NAME_ERR_TOOLONG;
 		return (-1);