scsi: xen: scsiback: Fix potential memory leak in scsiback_remove()

Memory allocated for struct vscsiblk_info in scsiback_probe() is not
freed in scsiback_remove() leading to potential memory leaks on remove,
as well as in the scsiback_probe() error paths. Fix that by freeing it
in scsiback_remove().

Cc: [email protected]
Fixes: d9d660f ("xen-scsiback: Add Xen PV SCSI backend driver")
Signed-off-by: Abdun Nihaal <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Abdun Nihaal

drivers/xen/xen-scsiback.c

@@ -1262,6 +1262,7 @@ static void scsiback_remove(struct xenbus_device *dev)
 	gnttab_page_cache_shrink(&info->free_pages, 0);
 
 	dev_set_drvdata(&dev->dev, NULL);
+	kfree(info);
 }
 
 static int scsiback_probe(struct xenbus_device *dev,