diff --git a/block/genhd.c b/block/genhd.c
index 2c9d1f5207c287b3fd80331103384b9c0706901c..6e8543ca69124e1ca28aaabac3bb719427746b6c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -518,6 +518,18 @@ void blk_free_devt(dev_t devt)
 	}
 }
 
+/**
+ *	We invalidate devt by assigning NULL pointer for devt in idr.
+ */
+void blk_invalidate_devt(dev_t devt)
+{
+	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {
+		spin_lock_bh(&ext_devt_lock);
+		idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt)));
+		spin_unlock_bh(&ext_devt_lock);
+	}
+}
+
 static char *bdevt_str(dev_t devt, char *buf)
 {
 	if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) {
@@ -771,6 +783,13 @@ void del_gendisk(struct gendisk *disk)
 
 	if (!(disk->flags & GENHD_FL_HIDDEN))
 		blk_unregister_region(disk_devt(disk), disk->minors);
+	/*
+	 * Remove gendisk pointer from idr so that it cannot be looked up
+	 * while RCU period before freeing gendisk is running to prevent
+	 * use-after-free issues. Note that the device number stays
+	 * "in-use" until we really free the gendisk.
+	 */
+	blk_invalidate_devt(disk_devt(disk));
 
 	kobject_put(disk->part0.holder_dir);
 	kobject_put(disk->slave_dir);
diff --git a/block/partition-generic.c b/block/partition-generic.c
index 5f8db5c5140f4004e2959f77e3ab2bcf795b196e..98d60a59b843c47add7e29b73a204944df6c88e3 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -289,6 +289,13 @@ void delete_partition(struct gendisk *disk, int partno)
 	kobject_put(part->holder_dir);
 	device_del(part_to_dev(part));
 
+	/*
+	 * Remove gendisk pointer from idr so that it cannot be looked up
+	 * while RCU period before freeing gendisk is running to prevent
+	 * use-after-free issues. Note that the device number stays
+	 * "in-use" until we really free the gendisk.
+	 */
+	blk_invalidate_devt(part_devt(part));
 	hd_struct_kill(part);
 }
 
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index f767293b00e666793844779378da26e8a1e928d8..f13272d8433200b5c846365b808a29180d21b12f 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -596,6 +596,7 @@ struct unixware_disklabel {
 
 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
 extern void blk_free_devt(dev_t devt);
+extern void blk_invalidate_devt(dev_t devt);
 extern dev_t blk_lookup_devt(const char *name, int partno);
 extern char *disk_name (struct gendisk *hd, int partno, char *buf);