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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2014-02-10 12:58:59 -0500
committerJiri Kosina <jkosina@suse.cz>2014-02-17 14:58:59 +0100
commit5318251744b2c8a288f91f4e53ed69f2a01d6412 (patch)
tree48fe1594feac12afa0832b271460ad58b0596afc
parent7e0bc880fce51ba3bd9128b8df9dc59567c5f73a (diff)
HID: core: check parameters when sending/receiving data from the device
It is better to check them soon enough before triggering any kernel panic. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c2
-rw-r--r--include/linux/hid.h6
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 5308656eec2e..1a955317d05f 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -276,7 +276,7 @@ static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
- /* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */
+ /* hid_hw_* already checked that data_len < HID_MAX_BUFFER_SIZE */
u16 size = 2 /* size */ +
(reportID ? 1 : 0) /* reportID */ +
data_len /* buf */;
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 09fbbd7fb784..60f3ff762376 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -989,6 +989,9 @@ static inline int hid_hw_raw_request(struct hid_device *hdev,
unsigned char reportnum, __u8 *buf,
size_t len, unsigned char rtype, int reqtype)
{
+ if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
+ return -EINVAL;
+
if (hdev->ll_driver->raw_request)
return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
rtype, reqtype);
@@ -1008,6 +1011,9 @@ static inline int hid_hw_raw_request(struct hid_device *hdev,
static inline int hid_hw_output_report(struct hid_device *hdev, __u8 *buf,
size_t len)
{
+ if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
+ return -EINVAL;
+
if (hdev->ll_driver->output_report)
return hdev->ll_driver->output_report(hdev, buf, len);