diff --git a/include/sys/dmu.h b/include/sys/dmu.h
index a5a5c378279a..6a5fb5530498 100644
--- a/include/sys/dmu.h
+++ b/include/sys/dmu.h
@@ -1066,7 +1066,7 @@ int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole,
 
 int dmu_read_l0_bps(objset_t *os, uint64_t object, uint64_t offset,
     uint64_t length, dmu_tx_t *tx, struct blkptr *bps, size_t *nbpsp);
-void dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset,
+int dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset,
     uint64_t length, dmu_tx_t *tx, const struct blkptr *bps, size_t nbps,
     boolean_t replay);
 
diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index f8accafd6d12..c1f9d02f0dd8 100644
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -2257,7 +2257,7 @@ dmu_read_l0_bps(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 	return (error);
 }
 
-void
+int
 dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
     dmu_tx_t *tx, const blkptr_t *bps, size_t nbps, boolean_t replay)
 {
@@ -2267,7 +2267,7 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 	struct dirty_leaf *dl;
 	dbuf_dirty_record_t *dr;
 	const blkptr_t *bp;
-	int numbufs;
+	int error = 0, i, numbufs;
 
 	spa = os->os_spa;
 
@@ -2275,7 +2275,26 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 	    &numbufs, &dbp));
 	ASSERT3U(nbps, ==, numbufs);
 
-	for (int i = 0; i < numbufs; i++) {
+	/*
+	 * Before we start cloning make sure that the dbufs sizes much new BPs
+	 * sizes. If they don't, that's a no-go, as we are not able to shrink
+	 * dbufs.
+	 */
+	for (i = 0; i < numbufs; i++) {
+		dbuf = dbp[i];
+		db = (dmu_buf_impl_t *)dbuf;
+		bp = &bps[i];
+
+		ASSERT0(db->db_level);
+		ASSERT(db->db_blkid != DMU_BONUS_BLKID);
+
+		if (!BP_IS_HOLE(bp) && BP_GET_LSIZE(bp) != dbuf->db_size) {
+			error = SET_ERROR(EXDEV);
+			goto out;
+		}
+	}
+
+	for (i = 0; i < numbufs; i++) {
 		dbuf = dbp[i];
 		db = (dmu_buf_impl_t *)dbuf;
 		bp = &bps[i];
@@ -2319,8 +2338,10 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
 			brt_pending_add(spa, bp, tx);
 		}
 	}
-
+out:
 	dmu_buf_rele_array(dbp, numbufs, FTAG);
+
+	return (error);
 }
 
 void
diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
index a6a27222bf4c..71955f90db03 100644
--- a/module/zfs/zfs_vnops.c
+++ b/module/zfs/zfs_vnops.c
@@ -1309,8 +1309,12 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
 			    ((len - 1) / inblksz + 1) * inblksz);
 		}
 
-		dmu_brt_clone(outos, outzp->z_id, outoff, size, tx, bps, nbps,
-		    B_FALSE);
+		error = dmu_brt_clone(outos, outzp->z_id, outoff, size, tx,
+		    bps, nbps, B_FALSE);
+		if (error != 0) {
+			dmu_tx_commit(tx);
+			break;
+		}
 
 		zfs_clear_setid_bits_if_necessary(outzfsvfs, outzp, cr,
 		    &clear_setid_bits_txg, tx);