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do_move_mount(): don't leak MNTNS_PROPAGATING on failures

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as it is, a failed move_mount(2) from anon namespace breaks
all further propagation into that namespace, including normal
mounts in non-anon namespaces that would otherwise propagate
there.

Fixes: 064fe6e233 ("mount: handle mount propagation for detached mount trees")
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2025-04-28 21:43:23 -04:00
parent 65781e19dc
commit 267fc3a06a
1 changed files with 2 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
fs/namespace.c
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@ -3715,15 +3715,14 @@ static int do_move_mount(struct path *old_path,
if (err)
goto out;
if (is_anon_ns(ns))
ns->mntns_flags &= ~MNTNS_PROPAGATING;
/* if the mount is moved, it should no longer be expire
* automatically */
list_del_init(&old->mnt_expire);
if (attached)
put_mountpoint(old_mp);
out:
if (is_anon_ns(ns))
ns->mntns_flags &= ~MNTNS_PROPAGATING;
unlock_mount(mp);
if (!err) {
if (attached) {