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Re: [PATCH 1/2] ipc,shm: move BUG_ON check into shm_lock

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  Re: [PATCH 1/2] ipc,shm: move BUG_ON check into shm_lock Davidlohr Bueso <dave@stgolabs.net> - 2015-06-04 02:30 +0200

#1158141 — Re: [PATCH 1/2] ipc,shm: move BUG_ON check into shm_lock

On Mon, 2015-06-01 at 15:52 -0700, Andrew Morton wrote:
> On Fri, 29 May 2015 17:03:05 -0700 Davidlohr Bueso <dave@stgolabs.net> wrote:
> 
> > Upon every shm_lock call, we BUG_ON if an error was returned,
> > indicating racing either in idr or in RMID. Move this logic
> > into the locking.
> > 
> > ...
> >
> > --- a/ipc/shm.c
> > +++ b/ipc/shm.c
> > @@ -155,8 +155,14 @@ static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
> >  {
> >  	struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);
> >  
> > -	if (IS_ERR(ipcp))
> > +	if (IS_ERR(ipcp)) {
> > +		/*
> > +		 * We raced in the idr lookup or with RMID,
> > +		 * either way, the ID is busted.
> > +		 */
> > +		BUG_ON(1);
> >  		return (struct shmid_kernel *)ipcp;
> > +	}
> >  

Sure, this is fine.

Thanks,
Davidlohr

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