CVE-2022-49313

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drivers: usb: host: Fix deadlock in oxu_bus_suspend()<br /> <br /> There is a deadlock in oxu_bus_suspend(), which is shown below:<br /> <br /> (Thread 1) | (Thread 2)<br /> | timer_action()<br /> oxu_bus_suspend() | mod_timer()<br /> spin_lock_irq() //(1) | (wait a time)<br /> ... | oxu_watchdog()<br /> del_timer_sync() | spin_lock_irq() //(2)<br /> (wait timer to stop) | ...<br /> <br /> We hold oxu-&gt;lock in position (1) of thread 1, and use<br /> del_timer_sync() to wait timer to stop, but timer handler<br /> also need oxu-&gt;lock in position (2) of thread 2. As a result,<br /> oxu_bus_suspend() will block forever.<br /> <br /> This patch extracts del_timer_sync() from the protection of<br /> spin_lock_irq(), which could let timer handler to obtain<br /> the needed lock.