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authorJohan Hovold <johan@kernel.org>2017-03-16 21:41:55 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-03-16 23:56:53 +0300
commitcb1b494663e037253337623bf1ef2df727883cb7 (patch)
tree4ce7f194f1357eb9a8f577a9e599f31fc22f2c7f /drivers/input/tablet
parentba340d7b83703768ce566f53f857543359aa1b98 (diff)
downloadlinux-cb1b494663e037253337623bf1ef2df727883cb7.tar.xz
Input: kbtab - validate number of endpoints before using them
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Signed-off-by: Johan Hovold <johan@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/tablet')
-rw-r--r--drivers/input/tablet/kbtab.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c
index e850d7e8afbc..4d9d64908b59 100644
--- a/drivers/input/tablet/kbtab.c
+++ b/drivers/input/tablet/kbtab.c
@@ -122,6 +122,9 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i
struct input_dev *input_dev;
int error = -ENOMEM;
+ if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+ return -ENODEV;
+
kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL);
input_dev = input_allocate_device();
if (!kbtab || !input_dev)