Commit a0ad220c authored by Oliver Neukum's avatar Oliver Neukum Committed by Dmitry Torokhov

Input: ims-pcu - sanity check against missing interfaces

A malicious device missing interface can make the driver oops.
Add sanity checking.
Signed-off-by: default avatarOliver Neukum <ONeukum@suse.com>
CC: stable@vger.kernel.org
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 9aa40426
...@@ -1663,6 +1663,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc ...@@ -1663,6 +1663,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc
pcu->ctrl_intf = usb_ifnum_to_if(pcu->udev, pcu->ctrl_intf = usb_ifnum_to_if(pcu->udev,
union_desc->bMasterInterface0); union_desc->bMasterInterface0);
if (!pcu->ctrl_intf)
return -EINVAL;
alt = pcu->ctrl_intf->cur_altsetting; alt = pcu->ctrl_intf->cur_altsetting;
pcu->ep_ctrl = &alt->endpoint[0].desc; pcu->ep_ctrl = &alt->endpoint[0].desc;
...@@ -1670,6 +1672,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc ...@@ -1670,6 +1672,8 @@ static int ims_pcu_parse_cdc_data(struct usb_interface *intf, struct ims_pcu *pc
pcu->data_intf = usb_ifnum_to_if(pcu->udev, pcu->data_intf = usb_ifnum_to_if(pcu->udev,
union_desc->bSlaveInterface0); union_desc->bSlaveInterface0);
if (!pcu->data_intf)
return -EINVAL;
alt = pcu->data_intf->cur_altsetting; alt = pcu->data_intf->cur_altsetting;
if (alt->desc.bNumEndpoints != 2) { if (alt->desc.bNumEndpoints != 2) {
......
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