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    Subject[ 12/28] usb: config->desc.bLength may not exceed amount of data returned by the device
    Date
    3.0-stable review patch.  If anyone has any objections, please let me know.

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

    From: Hans de Goede <hdegoede@redhat.com>

    commit b4f17a488ae2e09bfcf95c0e0b4219c246f1116a upstream.

    While reading the config parsing code I noticed this check is missing, without
    this check config->desc.wTotalLength can end up with a value larger then the
    dev->rawdescriptors length for the config, and when userspace then tries to
    get the rawdescriptors bad things may happen.

    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/core/config.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/usb/core/config.c
    +++ b/drivers/usb/core/config.c
    @@ -424,7 +424,8 @@ static int usb_parse_configuration(struc

    memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
    if (config->desc.bDescriptorType != USB_DT_CONFIG ||
    - config->desc.bLength < USB_DT_CONFIG_SIZE) {
    + config->desc.bLength < USB_DT_CONFIG_SIZE ||
    + config->desc.bLength > size) {
    dev_err(ddev, "invalid descriptor for config index %d: "
    "type = 0x%X, length = %d\n", cfgidx,
    config->desc.bDescriptorType, config->desc.bLength);



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