On 6/7/21 5:52 PM, Dan Williams wrote:
> The queue_to_disk() helper can not be used after del_gendisk()
> communicate @disk via the pgmap->owner.
>
> Otherwise, queue_to_disk() returns NULL resulting in the splat below.
>
> Kernel attempted to read user page (330) - exploit attempt? (uid: 0)
>
> Reported-by: Sachin Sant
> Fixes: 87eb73b2ca7c ("nvdimm-pmem: convert to
> blk_alloc_disk/blk_cleanup_disk")
> Link:
> http://lore.kernel.org/r/dfb75ba8-603f-4a35-880b-c5b23ef8f...@linux.vnet.ibm.com
> Cc: Christoph Hellwig
> Cc: Ulf Hansson
> Cc: Jens Axboe
> Signed-off-by: Dan Williams
Thanks Dan, this looks good to me:
Reviewed-by: Christoph Hellwig
Jens, can you quickly pick this up?
The queue_to_disk() helper can not be used after del_gendisk()
communicate @disk via the pgmap->owner.
Otherwise, queue_to_disk() returns NULL resulting in the splat below.
Kernel attempted to read user page (330) - exploit attempt? (uid: 0)
BUG: Kernel NULL pointer dereference on read at
