From: Oliver Neukum <[email protected]> commit 9cdabcb3ef8c24ca3a456e4db7b012befb688e73 upstream.
read() needs to check whether the device has been disconnected before it tries to talk to the device. Signed-off-by: Oliver Neukum <[email protected]> Reported-by: [email protected] Link: https://lore.kernel.org/r/[email protected] Cc: stable <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/usb/class/usblp.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -827,6 +827,11 @@ static ssize_t usblp_read(struct file *f if (rv < 0) return rv; + if (!usblp->present) { + count = -ENODEV; + goto done; + } + if ((avail = usblp->rstatus) < 0) { printk(KERN_ERR "usblp%d: error %d reading from printer\n", usblp->minor, (int)avail);
