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    Subject[PATCH 4.4 53/67] usb: gadget: dont dereference g until after it has been null checked
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Colin Ian King <colin.king@canonical.com>


    [ Upstream commit b2fc059fa549fe6881d4c1f8d698b0f50bcd16ec ]

    Avoid dereferencing pointer g until after g has been sanity null checked;
    move the assignment of cdev much later when it is required into a more
    local scope.

    Detected by CoverityScan, CID#1222135 ("Dereference before null check")

    Fixes: b785ea7ce662 ("usb: gadget: composite: fix ep->maxburst initialization")
    Signed-off-by: Colin Ian King <colin.king@canonical.com>
    Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/usb/gadget/composite.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    --- a/drivers/usb/gadget/composite.c
    +++ b/drivers/usb/gadget/composite.c
    @@ -104,7 +104,6 @@ int config_ep_by_speed(struct usb_gadget
    struct usb_function *f,
    struct usb_ep *_ep)
    {
    - struct usb_composite_dev *cdev = get_gadget_data(g);
    struct usb_endpoint_descriptor *chosen_desc = NULL;
    struct usb_descriptor_header **speed_desc = NULL;

    @@ -176,8 +175,12 @@ ep_found:
    _ep->maxburst = comp_desc->bMaxBurst + 1;
    break;
    default:
    - if (comp_desc->bMaxBurst != 0)
    + if (comp_desc->bMaxBurst != 0) {
    + struct usb_composite_dev *cdev;
    +
    + cdev = get_gadget_data(g);
    ERROR(cdev, "ep0 bMaxBurst must be 0\n");
    + }
    _ep->maxburst = 1;
    break;
    }

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