[PATCH] ubifs : fix oops when remounting with no_bulk_read.

[Richard Weinberger]

karam.lee,

Am 12.06.2017 um 03:46 schrieb karam.lee at lge.com:
> From: "karam.lee" <karam.lee at lge.com>
> 
> When remounting with the no_bulk_read option,
> there is a problem accessing the "bulk_read buffer(bu.buf)"
> which has already been freed.
> 
> If the bulk_read option is enabled,
> ubifs_tnc_bulk_read uses the pre-allocated bu.buf.
> 
> While bu.buf is being used by ubifs_tnc_bulk_read,
> remounting with no_bulk_read frees bu.buf.
> 
> So I added code to check the use of "bu.buf" to avoid this situation.

Agreed. We need to lock the buffer in this situation.
Thanks for fixing this.

Thanks,
//richard