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attach_recursive_mnt() needs to hold vfsmount_lock over set_mnt_shared()

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race in mnt_flags update

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-01-16 12:57:40 -05:00
parent 8ad08d8a0c
commit df1a1ad297
1 changed files with 2 additions and 2 deletions
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4
fs/namespace.c
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@ -1354,12 +1354,12 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt,
if (err)
goto out_cleanup_ids;
spin_lock(&vfsmount_lock);
if (IS_MNT_SHARED(dest_mnt)) {
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
}
spin_lock(&vfsmount_lock);
if (parent_path) {
detach_mnt(source_mnt, parent_path);
attach_mnt(source_mnt, path);