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Correctly parse DFU interfaces with extra vendor-specific data

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Fixes: https://github.com/hughsie/fwupd/issues/1152
This commit is contained in:
Richard Hughes 2019-04-16 11:29:35 +01:00 committed by Mario Limonciello
parent cce6a1cb5a
commit 8fada51919
1 changed files with 5 additions and 11 deletions
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16
plugins/dfu/dfu-device.c
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@ -200,7 +200,7 @@ static gboolean
dfu_device_parse_iface_data (DfuDevice *device, GBytes *iface_data, GError **error)
{
DfuDevicePrivate *priv = GET_PRIVATE (device);
DfuFuncDescriptor desc;
DfuFuncDescriptor desc = { 0x0 };
const guint8 *buf;
gsize sz;
@ -208,6 +208,10 @@ dfu_device_parse_iface_data (DfuDevice *device, GBytes *iface_data, GError **err
buf = g_bytes_get_data (iface_data, &sz);
if (sz == sizeof(DfuFuncDescriptor)) {
memcpy (&desc, buf, sz);
} else if (sz > sizeof(DfuFuncDescriptor)) {
g_debug ("DFU interface with %" G_GSIZE_FORMAT " bytes vendor data",
sz - sizeof(DfuFuncDescriptor));
memcpy (&desc, buf, sizeof(DfuFuncDescriptor));
} else if (sz == sizeof(DfuFuncDescriptor) - 2) {
g_warning ("truncated DFU interface data, no bcdDFUVersion");
memcpy (&desc, buf, sz);
@ -227,16 +231,6 @@ dfu_device_parse_iface_data (DfuDevice *device, GBytes *iface_data, GError **err
return FALSE;
}
/* check sanity */
if (desc.bLength != sz) {
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_DATA,
"DFU interface data has incorrect length: 0x%02x",
desc.bLength);
return FALSE;
}
/* get transfer size and version */
priv->transfer_size = GUINT16_FROM_LE (desc.wTransferSize);
priv->version = GUINT16_FROM_LE (desc.bcdDFUVersion);