From: Nikita Zhandarovich n.zhandarovich@fintech.ru
commit bd249b91977b768ea02bf84d04625d2690ad2b98 upstream.
If high bit is set to 1 in ((data[3] & 0x0f << 28), after all arithmetic operations and integer promotions are done, high bits in wacom->serial[idx] will be filled with 1s as well. Avoid this, albeit unlikely, issue by specifying left operand's __u64 type for the right operand.
Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.
Fixes: 3bea733ab212 ("USB: wacom tablet driver reorganization") Signed-off-by: Nikita Zhandarovich n.zhandarovich@fintech.ru Reviewed-by: Ping Cheng ping.cheng@wacom.com Cc: stable@vger.kernel.org Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hid/wacom_wac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -781,7 +781,7 @@ static int wacom_intuos_inout(struct wac /* Enter report */ if ((data[1] & 0xfc) == 0xc0) { /* serial number of the tool */ - wacom->serial[idx] = ((data[3] & 0x0f) << 28) + + wacom->serial[idx] = ((__u64)(data[3] & 0x0f) << 28) + (data[4] << 20) + (data[5] << 12) + (data[6] << 4) + (data[7] >> 4);