From 609603a5d3356c2c69c926038eee6755e0183d27 Mon Sep 17 00:00:00 2001
From: BearBabyLiu <liu.huang@zte.com.cn>
Date: Wed, 21 Sep 2016 10:09:22 +0800
Subject: [PATCH] Fix coverity defects

coverity scan CID:147504 Type: Explicit null dereferenced
Reason: passing null pointer dl to zfs_dirent_unlock

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: BearBabyLiu <liu.huang@zte.com.cn>
Closes #5131
---
 module/zfs/zfs_vnops.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
index 405b37c1925d..796cd1e342c4 100644
--- a/module/zfs/zfs_vnops.c
+++ b/module/zfs/zfs_vnops.c
@@ -1470,8 +1470,10 @@ top:
 		if (S_ISREG(ZTOI(zp)->i_mode) &&
 		    (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
 			/* we can't hold any locks when calling zfs_freesp() */
-			zfs_dirent_unlock(dl);
-			dl = NULL;
+			if (dl) {
+				zfs_dirent_unlock(dl);
+				dl = NULL;
+			}
 			error = zfs_freesp(zp, 0, 0, mode, TRUE);
 		}
 	}