From 74f61caed59f2e944750480b011df7bc67fded13 Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Fri, 10 Jul 2020 09:24:27 +0000
Subject: [PATCH] vfs: fix early termination of kern_getfsstat

The kernel would unlock already unlocked mutex if the buffer got filled up
before the mount list ended.

Reported by:	pho
Fixes:	r363069 ("vfs: depessimize getfsstat when only the count is requested")
---
 sys/kern/vfs_syscalls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index f37a54809e24..2caf09f3412c 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -551,7 +551,7 @@ kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize,
 
 		if (count == maxcount) {
 			vfs_unbusy(mp);
-			break;
+			goto out;
 		}
 
 		mtx_lock(&mountlist_mtx);