Commit 11ecdfc8 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman

usblp: fix race between disconnect() and read()

commit 9cdabcb3 upstream.

read() needs to check whether the device has been
disconnected before it tries to talk to the device.
Signed-off-by: default avatarOliver Neukum <oneukum@suse.com>
Reported-by: syzbot+be5b5f86a162a6c281e6@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20200917103427.15740-1-oneukum@suse.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e7fdd020
......@@ -840,6 +840,11 @@ static ssize_t usblp_read(struct file *file, char __user *buffer, size_t len, lo
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);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment