Between poll() being called and processed, the port can be unplugged. Check if this happened, and bail out.
CC: <[email protected]> Signed-off-by: Amit Shah <[email protected]> --- drivers/char/virtio_console.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 7728af9..1d4b748 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -967,6 +967,10 @@ static unsigned int port_fops_poll(struct file *filp, poll_table *wait) unsigned int ret; port = filp->private_data; + if (!port->guest_connected) { + /* Port was unplugged before we could proceed */ + return POLLHUP; + } poll_wait(filp, &port->waitqueue, wait); if (!port->guest_connected) { -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
