Re: [PATCH] smb/server: Fix another refcount leak in smb2_open()

[ChenXiaoSong]

Looks good. Feel free to add:
Reviewed-by: ChenXiaoSong <chenxiaosong@xxxxxxxxxx>

On 2026/2/27 13:54, Guenter Roeck wrote:
> If ksmbd_override_fsids() fails, we jump to err_out2. At that point, fp is
> NULL because it hasn't been assigned dh_info.fp yet, so ksmbd_fd_put(work,
> fp) will not be called. However, dh_info.fp was already inserted into the
> session file table by ksmbd_reopen_durable_fd(), so it will leak in the
> session file table until the session is closed.
>
> Move fp = dh_info.fp; ahead of the ksmbd_override_fsids() check to fix the
> problem.
>
> Found by an experimental AI code review agent at Google.
>
> Cc: Namjae Jeon <linkinjeon@xxxxxxxxxx>
> Cc: ChenXiaoSong <chenxiaosong@xxxxxxxxxxxxxxxx>
> Fixes: c8efcc786146a ("ksmbd: add support for durable handles v1/v2")
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
>   fs/smb/server/smb2pdu.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
> index 95901a78951c..8b680c96ee44 100644
> --- a/fs/smb/server/smb2pdu.c
> +++ b/fs/smb/server/smb2pdu.c
> @@ -3011,13 +3011,14 @@ int smb2_open(struct ksmbd_work *work)
>   				goto err_out2;
>   			}
>   
> +			fp = dh_info.fp;
> +
>   			if (ksmbd_override_fsids(work)) {
>   				rc = -ENOMEM;
>   				ksmbd_put_durable_fd(dh_info.fp);
>   				goto err_out2;
>   			}
>   
> -			fp = dh_info.fp;
>   			file_info = FILE_OPENED;
>   
>   			rc = ksmbd_vfs_getattr(&fp->filp->f_path, &stat);