From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 2 Mar 2022 21:11:23 +0000 (-0500)
Subject: blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
X-Git-Tag: howlett/maple/20220722_2~326^2~1
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=279b192c23d2fc9cb9e8c3851d6cad968f51789f;p=users%2Fjedix%2Flinux-maple.git

blob_to_mnt(): kern_unmount() is needed to undo kern_mount()

plain mntput() won't do.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/kernel/usermode_driver.c b/kernel/usermode_driver.c
index 9dae1f6487136..8303f4c7ca714 100644
--- a/kernel/usermode_driver.c
+++ b/kernel/usermode_driver.c
@@ -28,7 +28,7 @@ static struct vfsmount *blob_to_mnt(const void *data, size_t len, const char *na
 
 	file = file_open_root_mnt(mnt, name, O_CREAT | O_WRONLY, 0700);
 	if (IS_ERR(file)) {
-		mntput(mnt);
+		kern_unmount(mnt);
 		return ERR_CAST(file);
 	}
 
@@ -38,7 +38,7 @@ static struct vfsmount *blob_to_mnt(const void *data, size_t len, const char *na
 		if (err >= 0)
 			err = -ENOMEM;
 		filp_close(file, NULL);
-		mntput(mnt);
+		kern_unmount(mnt);
 		return ERR_PTR(err);
 	}