From: Oliver Neukum <oneukum@xxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit a0ad220c96692eda76b2e3fd7279f3dcd1d8a8ff ]
A malicious device missing interface can make the driver oops.
Add sanity checking.
Signed-off-by: Oliver Neukum <ONeukum@xxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/input/misc/ims-pcu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
index afed8e2..41ef29b 100644
--- a/drivers/input/misc/ims-pcu.c
+++ b/drivers/input/misc/ims-pcu.c
@@ -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,
union_desc->bMasterInterface0);
+ if (!pcu->ctrl_intf)
+ return -EINVAL;
alt = pcu->ctrl_intf->cur_altsetting;
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
pcu->data_intf = usb_ifnum_to_if(pcu->udev,
union_desc->bSlaveInterface0);
+ if (!pcu->data_intf)
+ return -EINVAL;
alt = pcu->data_intf->cur_altsetting;
if (alt->desc.bNumEndpoints != 2) {
--
2.5.0
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