From 599df8204962036c7b1039a8613c13bdb69c2e61 Mon Sep 17 00:00:00 2001
From: Pawel Jakub Dawidek <pawel@dawidek.net>
Date: Sat, 6 May 2023 00:51:41 +0900
Subject: [PATCH] Plug memory leak in zfsdev_state.

On kernel module unload, free all zfsdev state structures, except for
zfsdev_state_listhead, which is statically allocated.

Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #14824
---
 module/zfs/zfs_ioctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c
index 22e644f75f..3b1e2ae5fb 100644
--- a/module/zfs/zfs_ioctl.c
+++ b/module/zfs/zfs_ioctl.c
@@ -7862,6 +7862,8 @@ zfs_kmod_fini(void)
 			zfs_onexit_destroy(zs->zs_onexit);
 		if (zs->zs_zevent)
 			zfs_zevent_destroy(zs->zs_zevent);
+		if (zs != &zfsdev_state_listhead)
+			kmem_free(zs, sizeof (zfsdev_state_t));
 	}
 
 	zfs_ereport_taskq_fini();	/* run before zfs_fini() on Linux */