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HID: alps: Report an error if we receive invalid data in 't4_read_write_register()'

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If the data received is not what is expected, we should return an error.

Otherwise, we return 0 or a positive value which will be interpreted as
success, but '*read_val' has not been updated.

Fixes: 73196ebe13 ("HID: alps: add support for Alps T4 Touchpad device")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Christophe JAILLET 2018-03-19 21:53:26 +01:00 committed by Jiri Kosina
parent 4d18905314
commit 605f077290
1 changed files with 2 additions and 0 deletions
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2
drivers/hid/hid-alps.c
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@ -219,6 +219,8 @@ static int t4_read_write_register(struct hid_device *hdev, u32 address,
goto exit_readbuf;
}
ret = -EINVAL;
if (*(u32 *)&readbuf[6] != address) {
dev_err(&hdev->dev, "read register address error (%x,%x)\n",
*(u32 *)&readbuf[6], address);