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    Subject[PATCH 4.2 070/120] usb: dwc3: ep0: Fix mem corruption on OUT transfers of more than 512 bytes
    Date
    4.2-stable review patch.  If anyone has any objections, please let me know.

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

    From: Kishon Vijay Abraham I <kishon@ti.com>

    commit b2fb5b1a0f50d3ebc12342c8d8dead245e9c9d4e upstream.

    DWC3 uses bounce buffer to handle non max packet aligned OUT transfers and
    the size of bounce buffer is 512 bytes. However if the host initiates OUT
    transfers of size more than 512 bytes (and non max packet aligned), the
    driver throws a WARN dump but still programs the TRB to receive more than
    512 bytes. This will cause bounce buffer to overflow and corrupt the
    adjacent memory locations which can be fatal.

    Fix it by programming the TRB to receive a maximum of DWC3_EP0_BOUNCE_SIZE
    (512) bytes.

    Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
    Signed-off-by: Felipe Balbi <balbi@ti.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/dwc3/ep0.c | 12 ++++++++++--
    1 file changed, 10 insertions(+), 2 deletions(-)

    --- a/drivers/usb/dwc3/ep0.c
    +++ b/drivers/usb/dwc3/ep0.c
    @@ -820,6 +820,11 @@ static void dwc3_ep0_complete_data(struc
    unsigned maxp = ep0->endpoint.maxpacket;

    transfer_size += (maxp - (transfer_size % maxp));
    +
    + /* Maximum of DWC3_EP0_BOUNCE_SIZE can only be received */
    + if (transfer_size > DWC3_EP0_BOUNCE_SIZE)
    + transfer_size = DWC3_EP0_BOUNCE_SIZE;
    +
    transferred = min_t(u32, ur->length,
    transfer_size - length);
    memcpy(ur->buf, dwc->ep0_bounce, transferred);
    @@ -941,11 +946,14 @@ static void __dwc3_ep0_do_control_data(s
    return;
    }

    - WARN_ON(req->request.length > DWC3_EP0_BOUNCE_SIZE);
    -
    maxpacket = dep->endpoint.maxpacket;
    transfer_size = roundup(req->request.length, maxpacket);

    + if (transfer_size > DWC3_EP0_BOUNCE_SIZE) {
    + dev_WARN(dwc->dev, "bounce buf can't handle req len\n");
    + transfer_size = DWC3_EP0_BOUNCE_SIZE;
    + }
    +
    dwc->ep0_bounced = true;

    /*



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