Re: [PATCH v2] staging: erofs: keep corrupted fs from crashing kernel in erofs_namei()

[Dan Carpenter]

On Fri, Feb 15, 2019 at 03:02:25PM +0800, Chao Yu wrote:
> On 2019/2/1 20:16, Gao Xiang wrote:
> > +	/*
> > +	 * on-disk error, let's only BUG_ON in the debugging mode.
> > +	 * otherwise, it will return 1 to just skip the invalid name
> > +	 * and go on (in consideration of the lookup performance).
> > +	 */
> > +	DBG_BUGON(qd->name > qd->end);
> 
> qd->name == qd->end is not allowed as well?
> 
> So will it be better to return directly here?
> 
> 	if (unlikely(qd->name >= qd->end)) {
> 		DBG_BUGON(1);
> 		return 1;
> 	}

Please don't add likely/unlikely() annotations unless you have
benchmarked it and it makes a difference.

regards,
dan carpenter