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    Subject[PATCH 4.4 044/160] xen-swiotlb: use actually allocated size on check physical continuous
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Joe Jin <joe.jin@oracle.com>

    commit 7250f422da0480d8512b756640f131b9b893ccda upstream.

    xen_swiotlb_{alloc,free}_coherent() allocate/free memory based on the
    order of the pages and not size argument (bytes). This is inconsistent with
    range_straddles_page_boundary and memset which use the 'size' value,
    which may lead to not exchanging memory with Xen (range_straddles_page_boundary()
    returned true). And then the call to xen_swiotlb_free_coherent() would
    actually try to exchange the memory with Xen, leading to the kernel
    hitting an BUG (as the hypercall returned an error).

    This patch fixes it by making the 'size' variable be of the same size
    as the amount of memory allocated.

    CC: stable@vger.kernel.org
    Signed-off-by: Joe Jin <joe.jin@oracle.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Christoph Helwig <hch@lst.de>
    Cc: Dongli Zhang <dongli.zhang@oracle.com>
    Cc: John Sobecki <john.sobecki@oracle.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/xen/swiotlb-xen.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/xen/swiotlb-xen.c
    +++ b/drivers/xen/swiotlb-xen.c
    @@ -310,6 +310,9 @@ xen_swiotlb_alloc_coherent(struct device
    */
    flags &= ~(__GFP_DMA | __GFP_HIGHMEM);

    + /* Convert the size to actually allocated. */
    + size = 1UL << (order + XEN_PAGE_SHIFT);
    +
    /* On ARM this function returns an ioremap'ped virtual address for
    * which virt_to_phys doesn't return the corresponding physical
    * address. In fact on ARM virt_to_phys only works for kernel direct
    @@ -359,6 +362,9 @@ xen_swiotlb_free_coherent(struct device
    * physical address */
    phys = xen_bus_to_phys(dev_addr);

    + /* Convert the size to actually allocated. */
    + size = 1UL << (order + XEN_PAGE_SHIFT);
    +
    if (((dev_addr + size - 1 <= dma_mask)) ||
    range_straddles_page_boundary(phys, size))
    xen_destroy_contiguous_region(phys, order);

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