usbip: synchronize event handler with sysfs code paths

commit 363eaa3a450abb4e63bd6e3ad79d1f7a0f717814 upstream.

Fuzzing uncovered race condition between sysfs code paths in usbip
drivers. Device connect/disconnect code paths initiated through
sysfs interface are prone to races if disconnect happens during
connect and vice versa.

Use sysfs_lock to synchronize event handler with sysfs paths
in usbip drivers.

Cc: stable@vger.kernel.org # 4.9.x
Reported-and-tested-by: syzbot+a93fba6d384346a761e3@syzkaller.appspotmail.com
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/c5c8723d3f29dfe3d759cfaafa7dd16b0dfe2918.1616807117.git.skhan@linuxfoundation.org
Signed-off-by: Tom Seewald <tseewald@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/usbip/usbip_event.c b/drivers/usb/usbip/usbip_event.c
index f8f7f3803a99c8ce551e7b935400f0f884891c67..01eaae1f265b299954986c5d61f4fd018d3fe240 100644 (file)
--- a/drivers/usb/usbip/usbip_event.c
+++ b/drivers/usb/usbip/usbip_event.c
@@ -84,6 +84,7 @@ static void event_handler(struct work_struct *work)
        while ((ud = get_event()) != NULL) {
                usbip_dbg_eh("pending event %lx\n", ud->event);
 
+               mutex_lock(&ud->sysfs_lock);
                /*
                 * NOTE: shutdown must come first.
                 * Shutdown the device.
@@ -104,6 +105,7 @@ static void event_handler(struct work_struct *work)
                        ud->eh_ops.unusable(ud);
                        unset_event(ud, USBIP_EH_UNUSABLE);
                }
+               mutex_unlock(&ud->sysfs_lock);
 
                wake_up(&ud->eh_waitq);
        }