diff --git a/archival/libarchive/liblzo.h b/archival/libarchive/liblzo.h
index 843997c..4596620 100644
--- a/archival/libarchive/liblzo.h
+++ b/archival/libarchive/liblzo.h
@@ -76,11 +76,13 @@
 #    define TEST_IP             (ip < ip_end)
 #    define NEED_IP(x) \
             if ((unsigned)(ip_end - ip) < (unsigned)(x))  goto input_overrun
+#    define TEST_IV(x)          if ((x) > (unsigned)0 - (511)) goto input_overrun
 
 #    undef TEST_OP              /* don't need both of the tests here */
 #    define TEST_OP             1
 #    define NEED_OP(x) \
             if ((unsigned)(op_end - op) < (unsigned)(x))  goto output_overrun
+#    define TEST_OV(x)          if ((x) > (unsigned)0 - (511)) goto output_overrun
 
 #define HAVE_ANY_OP 1
 
diff --git a/archival/libarchive/lzo1x_d.c b/archival/libarchive/lzo1x_d.c
index 9bc1270..40b167e 100644
--- a/archival/libarchive/lzo1x_d.c
+++ b/archival/libarchive/lzo1x_d.c
@@ -92,6 +92,7 @@
 				ip++;
 				NEED_IP(1);
 			}
+			TEST_IV(t);
 			t += 15 + *ip++;
 		}
 		/* copy literals */
@@ -224,6 +225,7 @@
 						ip++;
 						NEED_IP(1);
 					}
+					TEST_IV(t);
 					t += 31 + *ip++;
 				}
 #if defined(COPY_DICT)
@@ -265,6 +267,7 @@
 						ip++;
 						NEED_IP(1);
 					}
+					TEST_IV(t);
 					t += 7 + *ip++;
 				}
 #if defined(COPY_DICT)