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HID: i2c-hid: fix memory corruption due to missing hid declaration 

HID descriptors contains 4 bytes of reserved field.
The previous implementation was overriding the next fields in struct i2c_hid.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2012-12-05 15:02:53 +01:00 committed by Jiri Kosina
parent addb114dd6
commit 27174cff8f
1 changed files with 8 additions and 1 deletions
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9
drivers/hid/i2c-hid/i2c-hid.c
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@ -69,6 +69,7 @@ struct i2c_hid_desc {
__le16 wVendorID;
__le16 wProductID;
__le16 wVersionID;
__le32 reserved;
} __packed;
struct i2c_hid_cmd {
@ -776,7 +777,13 @@ static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
}
dsize = le16_to_cpu(hdesc->wHIDDescLength);
if (!dsize || dsize > HID_MAX_DESCRIPTOR_SIZE) {
/*
* the size of the HID descriptor should at least contain
* its size and the bcdVersion (4 bytes), and should not be greater
* than sizeof(struct i2c_hid_desc) as we directly fill this struct
* through i2c_hid_command.
*/
if (dsize < 4 || dsize > sizeof(struct i2c_hid_desc)) {
dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
dsize);
return -ENODEV;