Between poll() being called and processed, the port can be unplugged.
Check if this happened, and bail out.
CC: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
---
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
--
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