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| author | Benjamin Tissoires <benjamin.tissoires@gmail.com> | 2012-12-05 15:02:53 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-12-06 10:54:26 +0100 |
| commit | 27174cff8fcfcb3a60a3e7225cc627f6a4b7f827 (patch) | |
| tree | d4992c47aedd6710f0facb90bc463a5219693c59 | |
| parent | addb114dd646f9386f5845cdb059f22a497f9a9d (diff) | |
| download | linux-27174cff8fcfcb3a60a3e7225cc627f6a4b7f827.tar.bz2 | |
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>
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index 7062df21da52..34cca428a6a9 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -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; |