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ethtool: fix error handling in ethtool_phys_id

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If ops->set_phys_id() returned an error, previously we would only break
 out of the inner loop, which neither stopped the outer loop nor returned
 the error to the user (since 'rc' would be overwritten on the next pass
 through the loop).
Thus, rewrite it to use a single loop, so that the break does the right
 thing.  Use u64 for 'count' and 'i' to prevent overflow in case of
 (unreasonably) large values of id.data and n.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2020-09-01 18:52:32 +01:00 committed by David S. Miller
parent 30ae801746
commit 2adc6edcae
1 changed files with 10 additions and 15 deletions
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25
net/ethtool/ioctl.c
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@ -1861,23 +1861,18 @@ static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
} else {
/* Driver expects to be called at twice the frequency in rc */
int n = rc * 2, i, interval = HZ / n;
int n = rc * 2, interval = HZ / n;
u64 count = n * id.data, i = 0;
/* Count down seconds */
do {
/* Count down iterations per second */
i = n;
do {
rtnl_lock();
rc = ops->set_phys_id(dev,
(i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
rtnl_unlock();
if (rc)
break;
schedule_timeout_interruptible(interval);
} while (!signal_pending(current) && --i != 0);
} while (!signal_pending(current) &&
(id.data == 0 || --id.data != 0));
rtnl_lock();
rc = ops->set_phys_id(dev,
(i++ & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
rtnl_unlock();
if (rc)
break;
schedule_timeout_interruptible(interval);
} while (!signal_pending(current) && (!id.data || i < count));
}
rtnl_lock();