Re: KASAN: use-after-free Read in hidraw_ioctl

[Alan Stern]

#syz test: https://github.com/google/kasan.git e96407b4

Index: usb-devel/drivers/hid/hidraw.c
===================================================================
--- usb-devel.orig/drivers/hid/hidraw.c
+++ usb-devel/drivers/hid/hidraw.c
@@ -370,7 +370,7 @@ static long hidraw_ioctl(struct file *fi
 
        mutex_lock(&minors_lock);
        dev = hidraw_table[minor];
-       if (!dev) {
+       if (!dev || !dev->exist) {
                ret = -ENODEV;
                goto out;
        }