linux-kernel - Re: [PATCH] SQUASHME: Streamline pmem.c

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Date:	Thu, 26 Mar 2015 16:22:22 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Christoph Hellwig <hch@....de>, linux-nvdimm@...1.01.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, axboe@...nel.dk
Subject: Re: [PATCH] SQUASHME: Streamline pmem.c

On Thu, 2015-03-26 at 19:02 +0200, Boaz Harrosh wrote:
>  static void pmem_do_bvec(struct pmem_device *pmem, struct page *page,
>  			unsigned int len, unsigned int off, int rw,
>  			sector_t sector)
>  {
>  	void *mem = kmap_atomic(page);
> +	size_t pmem_off = sector << 9;
> +
> +	BUG_ON(pmem_off >= pmem->size);

This check should take 'len' into account so we don't copy off the end of our
PMEM space.

We should also just return -EIO back up to pmem_make_request() and have that
fail the bio, as opposed to doing the drastic BUG_ON.


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