[ Upstream commit 6fe55c2799bc29624770c26f98ba7b06214f43e0 ]
last component point filename struct. Currently putname is called after vfs_path_parent_lookup(). And then last component is used for lookup_one_qstr_excl(). name in last component is freed by previous calling putname(). And It cause file lookup failure when testing generic/464 test of xfstest.
Fixes: 74d7970febf7 ("ksmbd: fix racy issue from using ->d_parent and ->d_name") Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com --- fs/ksmbd/vfs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c index 8956131df631..a48d53c4587c 100644 --- a/fs/ksmbd/vfs.c +++ b/fs/ksmbd/vfs.c @@ -86,12 +86,14 @@ static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf, err = vfs_path_parent_lookup(filename, flags, &parent_path, &last, &type, root_share_path); - putname(filename); - if (err) + if (err) { + putname(filename); return err; + }
if (unlikely(type != LAST_NORM)) { path_put(&parent_path); + putname(filename); return -ENOENT; }
@@ -108,12 +110,14 @@ static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf, path->dentry = d; path->mnt = share_conf->vfs_path.mnt; path_put(&parent_path); + putname(filename);
return 0;
err_out: inode_unlock(parent_path.dentry->d_inode); path_put(&parent_path); + putname(filename); return -ENOENT; }