From a1c5578ce0ffaa5baaa22177cafea36aa8145d8d Mon Sep 17 00:00:00 2001
From: Pavel Snajdr <snajpa@snajpa.net>
Date: Mon, 7 Sep 2020 17:27:51 +0200
Subject: [PATCH] dmu_redact_snap: fix possible memleak

Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pavel Snajdr <snajpa@snajpa.net>
Closes #10879
---
 module/zfs/dmu_redact.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/module/zfs/dmu_redact.c b/module/zfs/dmu_redact.c
index b091df925..c53fba75c 100644
--- a/module/zfs/dmu_redact.c
+++ b/module/zfs/dmu_redact.c
@@ -1078,6 +1078,8 @@ dmu_redact_snap(const char *snapname, nvlist_t *redactnvl,
 		dsl_pool_rele(dp, FTAG);
 		kmem_free(newredactbook,
 		    sizeof (char) * ZFS_MAX_DATASET_NAME_LEN);
+		if (args != NULL)
+			kmem_free(args, numsnaps * sizeof (*args));
 		return (SET_ERROR(ENAMETOOLONG));
 	}
 	err = dsl_bookmark_lookup(dp, newredactbook, NULL, &bookmark);