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Subject[PATCH 3.12 076/142] Input: hanwang - validate number of endpoints before using them
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From: Johan Hovold <johan@kernel.org>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit ba340d7b83703768ce566f53f857543359aa1b98 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: bba5394ad3bd ("Input: add support for Hanwang tablets")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/input/tablet/hanwang.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/input/tablet/hanwang.c b/drivers/input/tablet/hanwang.c
index 5cc04124995c..263c85e72e14 100644
--- a/drivers/input/tablet/hanwang.c
+++ b/drivers/input/tablet/hanwang.c
@@ -341,6 +341,9 @@ static int hanwang_probe(struct usb_interface *intf, const struct usb_device_id
int error;
int i;

+ if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+ return -ENODEV;
+
hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL);
input_dev = input_allocate_device();
if (!hanwang || !input_dev) {
--
2.12.2
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