as per subject, otherwise we read out of bound.

diff 88dec1791eeb2f779795789b119d5bf675c24b6a 0a8a9c8f2be324315ed3529bb48871c3bd0505b4
commit - 88dec1791eeb2f779795789b119d5bf675c24b6a
commit + 0a8a9c8f2be324315ed3529bb48871c3bd0505b4
blob - 5779ba728d64bd7ba33214a09f3f0a31c5caf882
blob + becc8ffd68217466f0bad6d811196c0d7137e4df
--- lib/pack.c
+++ lib/pack.c
@@ -1781,8 +1781,10 @@ read_raw_delta_data(uint8_t **delta_buf, size_t *delta
 		goto done;
 	}
 	if (pack->map) {
-		if (delta_data_offset >= pack->filesize)
+		if (delta_data_offset >= pack->filesize) {
 			err = got_error(GOT_ERR_PACK_OFFSET);
+			goto done;
+		}
 		memcpy(*delta_buf, pack->map + delta_data_offset,
 		    *delta_len_compressed);
 	} else {