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Commit 338f7566 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
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[PKT_SCHED]: Potential jiffy wrap bug in dev_watchdog(). 



There is a potential jiffy wraparound bug in the transmit watchdog
that is easily avoided by using time_after().

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 716f8954

net/sched/sch_generic.c

+4 −2
Original line number Diff line number Diff line
@@ -193,8 +193,10 @@ static void dev_watchdog(unsigned long arg) 
		    netif_running(dev) &&

		    netif_carrier_ok(dev)) {

			if (netif_queue_stopped(dev) &&

			    (jiffies - dev->trans_start) > dev->watchdog_timeo) {

				printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", dev->name);

			    time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {



				printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",

				       dev->name);

				dev->tx_timeout(dev);

			}

			if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))