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can: peak_usb: fix potential integer overflow on shift of a int 

The left shift of int 32 bit integer constant 1 is evaluated using 32 bit
arithmetic and then assigned to a signed 64 bit variable. In the case where
time_ref->adapter->ts_used_bits is 32 or more this can lead to an oveflow.
Avoid this by shifting using the BIT_ULL macro instead.

Fixes: bb4785551f ("can: usb: PEAK-System Technik USB adapters driver core")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201105112427.40688-1-colin.king@canonical.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
zero-sugar-mainline-defconfig
Colin Ian King 2020-11-05 11:24:27 +00:00 committed by Marc Kleine-Budde
parent 81c9c8e0ad
commit 8a68cc0d69
1 changed files with 2 additions and 2 deletions
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4
drivers/net/can/usb/peak_usb/pcan_usb_core.c
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@ -156,7 +156,7 @@ void peak_usb_get_ts_time(struct peak_time_ref *time_ref, u32 ts, ktime_t *time)
if (time_ref->ts_dev_1 < time_ref->ts_dev_2) {
/* case when event time (tsw) wraps */
if (ts < time_ref->ts_dev_1)
delta_ts = 1 << time_ref->adapter->ts_used_bits;
delta_ts = BIT_ULL(time_ref->adapter->ts_used_bits);
/* Otherwise, sync time counter (ts_dev_2) has wrapped:
* handle case when event time (tsn) hasn't.
@ -168,7 +168,7 @@ void peak_usb_get_ts_time(struct peak_time_ref *time_ref, u32 ts, ktime_t *time)
* tsn ts
*/
} else if (time_ref->ts_dev_1 < ts) {
delta_ts = -(1 << time_ref->adapter->ts_used_bits);
delta_ts = -BIT_ULL(time_ref->adapter->ts_used_bits);
}
/* add delay between last sync and event timestamps */