diff mbox series

[net-next] ethtool: fix error handling in ethtool_phys_id

Message ID 99914576-a923-b9d9-3dea-62732508b4ad@solarflare.com
State New
Headers show
Series [net-next] ethtool: fix error handling in ethtool_phys_id | expand

Commit Message

Edward Cree Sept. 1, 2020, 5:52 p.m. UTC
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>
---
 net/ethtool/ioctl.c | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)
diff mbox series

Patch

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index e6f5cf52023c..3e74c2f74625 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -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();