Re: [Qemu-devel] [PATCH] block/qdev: Fix NULL access when using BB twice

[Kevin Wolf <kwolf@redhat.com>]

Am 23.06.2016 um 09:30 hat Kevin Wolf geschrieben:
> BlockBackend has only a single pointer to its guest device, so it makes
> sure that only a single guest device is attached to it. device-add
> returns an error if you try to attach a second device to a BB. In order
> to make the error message nicer, -device that manually connects to a
> if=none block device get a different message than -drive that implicitly
> creates a guest device. The if=... option is stored in DriveInfo.
> 
> However, since blockdev-add exists, not every BlockBackend has a
> DriveInfo any more. Check that it exists before we dereference it.
> 
> QMP reproducer resulting in a segfault:
> 
> {"execute":"blockdev-add","arguments":{"options":{"id":"disk","driver":"file","filename":"/tmp/test.img"}}}
> {"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}
> {"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>

Applied to my block branch.

Kevin