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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-26 10:58:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-26 10:58:44 -0700
commit863fa8887befa19c89fadb1dc6666ac34314fbce (patch)
tree18f8a55421cdc0f194e2aca9b96b1fbde369dd42
parent04412819652fe30f900d11e96c67b4adfdf17f6b (diff)
parent19a1c4092e7ca1ad1a72ac5535f902c483372cd5 (diff)
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs umount_tree() leak fix from Al Viro: "Fix braino introduced in 'switch the remnants of releasing the mountpoint away from fs_pin'. The most visible result is leaking struct mount when mounting btrfs, making it impossible to shut down" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fix the struct mount leak in umount_tree()
-rw-r--r--fs/namespace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 6464ea4acba9..d28d30b13043 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1463,7 +1463,6 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
p->mnt.mnt_flags |= MNT_SYNC_UMOUNT;
disconnect = disconnect_mount(p, how);
-
if (mnt_has_parent(p)) {
mnt_add_count(p->mnt_parent, -1);
if (!disconnect) {
@@ -1471,10 +1470,11 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
list_add_tail(&p->mnt_child, &p->mnt_parent->mnt_mounts);
} else {
umount_mnt(p);
- hlist_add_head(&p->mnt_umount, &unmounted);
}
}
change_mnt_propagation(p, MS_PRIVATE);
+ if (disconnect)
+ hlist_add_head(&p->mnt_umount, &unmounted);
}
}

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