[v2] cifs: Fix connections leak when tlink setup failed

If the tlink setup failed, lost to put the connections, then
the module refcnt leak since the cifsd kthread not exit.

Also leak the fscache info, and for next mount with fsc, it will
print the follow errors:
  CIFS: Cache volume key already in use (cifs,127.0.0.1:445,TEST)

Let's check the result of tlink setup, and do some cleanup.

Fixes: 56c762eb9bee ("cifs: Refactor out cifs_mount()")
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
---
v2: goto error rather than only put connections.

 fs/cifs/connect.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Zhang Xiaoxu <zhangxiaoxu5@huawei.com> writes:

> If the tlink setup failed, lost to put the connections, then
> the module refcnt leak since the cifsd kthread not exit.
>
> Also leak the fscache info, and for next mount with fsc, it will
> print the follow errors:
>   CIFS: Cache volume key already in use (cifs,127.0.0.1:445,TEST)
>
> Let's check the result of tlink setup, and do some cleanup.
>
> Fixes: 56c762eb9bee ("cifs: Refactor out cifs_mount()")
> Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
> ---
> v2: goto error rather than only put connections.
>
>  fs/cifs/connect.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)

Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>

tentatively merged into cifs-2.6.git for-next pending testing

On Fri, Nov 11, 2022 at 12:07 AM Zhang Xiaoxu <zhangxiaoxu5@huawei.com> wrote:
>
> If the tlink setup failed, lost to put the connections, then
> the module refcnt leak since the cifsd kthread not exit.
>
> Also leak the fscache info, and for next mount with fsc, it will
> print the follow errors:
>   CIFS: Cache volume key already in use (cifs,127.0.0.1:445,TEST)
>
> Let's check the result of tlink setup, and do some cleanup.
>
> Fixes: 56c762eb9bee ("cifs: Refactor out cifs_mount()")
> Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
> ---
> v2: goto error rather than only put connections.
>
>  fs/cifs/connect.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 1cc47dd3b4d6..9db9527c61cf 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -3855,9 +3855,13 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
>         uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
>
>  out:
> -       free_xid(mnt_ctx.xid);
>         cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
> -       return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
> +       rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
> +       if (rc)
> +               goto error;
> +
> +       free_xid(mnt_ctx.xid);
> +       return rc;
>
>  error:
>         dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
> @@ -3884,8 +3888,12 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
>                         goto error;
>         }
>
> +       rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
> +       if (rc)
> +               goto error;
> +
>         free_xid(mnt_ctx.xid);
> -       return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
> +       return rc;
>
>  error:
>         mount_put_conns(&mnt_ctx);
> --
> 2.31.1
>