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xen/blkback: don't call vbd_size() if bd_disk is NULL 

...because vbd_size() dereferences bd_disk if bd_part is NULL.

Signed-off-by: Laszlo Ersek<lersek@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Laszlo Ersek 2011-05-25 12:24:25 +02:00 committed by Konrad Rzeszutek Wilk
parent 4c49ff3fe1
commit 6464920a6e
1 changed files with 1 additions and 2 deletions
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3
drivers/block/xen-blkback/xenbus.c
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@ -357,14 +357,13 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
}
vbd->bdev = bdev;
vbd->size = vbd_sz(vbd);
if (vbd->bdev->bd_disk == NULL) {
DPRINTK("xen_vbd_create: device %08x doesn't exist.\n",
vbd->pdevice);
xen_vbd_free(vbd);
return -ENOENT;
}
vbd->size = vbd_sz(vbd);
if (vbd->bdev->bd_disk->flags & GENHD_FL_CD || cdrom)
vbd->type |= VDISK_CDROM;