Re: [PATCH] SUNRPC: Add a check for gss_release_msg

[Trond Myklebust]

On Tue, 2021-04-06 at 19:16 -0500, Aditya Pakki wrote:
> In gss_pipe_destroy_msg(), in case of error in msg, gss_release_msg
> deletes gss_msg. The patch adds a check to avoid a potential double
> free.
> 
> Signed-off-by: Aditya Pakki <pakki001@xxxxxxx>
> ---
>  net/sunrpc/auth_gss/auth_gss.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sunrpc/auth_gss/auth_gss.c
> b/net/sunrpc/auth_gss/auth_gss.c
> index 5f42aa5fc612..eb52eebb3923 100644
> --- a/net/sunrpc/auth_gss/auth_gss.c
> +++ b/net/sunrpc/auth_gss/auth_gss.c
> @@ -848,7 +848,8 @@ gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
>                         warn_gssd();
>                 gss_release_msg(gss_msg);
>         }
> -       gss_release_msg(gss_msg);
> +       if (gss_msg)
> +               gss_release_msg(gss_msg);
>  }
>  
>  static void gss_pipe_dentry_destroy(struct dentry *dir,


NACK. There's no double free there.

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@xxxxxxxxxxxxxxx