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authorBenjamin Tissoires <benjamin.tissoires@gmail.com>2012-12-05 15:02:53 +0100
committerJiri Kosina <jkosina@suse.cz>2012-12-06 10:54:26 +0100
commit27174cff8fcfcb3a60a3e7225cc627f6a4b7f827 (patch)
treed4992c47aedd6710f0facb90bc463a5219693c59 /drivers/hid
parentaddb114dd646f9386f5845cdb059f22a497f9a9d (diff)
downloadlinux-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>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c9
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;