On 31.12.2017 01:53, Bart Van Assche wrote:

On Sat, 2017-12-30 at 22:41 +0100, Maciej S. Szmigiero wrote:

quoted

This commit causes a NULL pointer dereference when adding a pktcdvd
mapping.

Reproducing it is simple:
# pktsetup 1 /dev/cdrom 

Specifically, the NULL dereference happens inside bdev_get_queue(bdev),
which is supposed to return bdev->bd_disk->queue, but in this case
bdev->bd_disk is NULL.

Would it be possible to test the two attached patches?

I've tested 4.14.10 with both applied and can confirm that the NULL
pointer dereference when adding a pktcdvd mapping no longer happens
then.

Thanks,

Bart.

Thanks,
Maciej