Re: [PATCH 071/190] Revert "pppoe: remove redundant BUG_ON() check in pppoe_pernet"

[Greg Kroah-Hartman]

On Wed, Apr 21, 2021 at 02:59:06PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 02a896ca84874bbfcedc006303f2951dda89b298.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Aditya Pakki <pakki001@xxxxxxx>
> Cc: David S. Miller <davem@xxxxxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/net/ppp/pppoe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
> index d7f50b835050..803a4fe1ca18 100644
> --- a/drivers/net/ppp/pppoe.c
> +++ b/drivers/net/ppp/pppoe.c
> @@ -119,6 +119,8 @@ static inline bool stage_session(__be16 sid)
>  
>  static inline struct pppoe_net *pppoe_pernet(struct net *net)
>  {
> +	BUG_ON(!net);
> +
>  	return net_generic(net, pppoe_net_id);
>  }
>  
> -- 
> 2.31.1
> 

THe original here was correct so I'll drop this revert.

greg k-h