index-pack: fix memory leaks

Fix various memory leaks in "git index-pack", due to how tightly
coupled this command is with the revision walking this doesn't make
any new tests pass.

But e.g. this now passes, and had several failures before, i.e. we
still have failures in tests 3, 5 etc., which are being skipped here.

    ./t5300-pack-object.sh --run=1-2,4,6-27,30-42

It is a bit odd that we'll free "opts.anomaly", since the "opts" is a
"struct pack_idx_option" declared in pack.h. In pack-write.c there's a
reset_pack_idx_option(), but it only wipes the contents, but doesn't
free() anything.

Doing this here in cmd_index_pack() is correct because while the
struct is declared in pack.h, this code in builtin/index-pack.c (in
read_v2_anomalous_offsets()) is what allocates the "opts.anomaly", so
we should also free it here.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

builtin/index-pack.c

@@ -1109,6 +1109,7 @@ static void *threaded_second_pass(void *data)
 			list_add(&child->list, &work_head);
 			base_cache_used += child->size;
 			prune_base_data(NULL);
+			free_base_data(child);
 		} else {
 			/*
 			 * This child does not have its own children. It may be
@@ -1131,6 +1132,7 @@ static void *threaded_second_pass(void *data)
 
 				p = next_p;
 			}
+			FREE_AND_NULL(child);
 		}
 		work_unlock();
 	}
@@ -1424,6 +1426,7 @@ static void fix_unresolved_deltas(struct hashfile *f)
 		 * object).
 		 */
 		append_obj_to_pack(f, d->oid.hash, data, size, type);
+		free(data);
 		threaded_second_pass(NULL);
 
 		display_progress(progress, nr_resolved_deltas);
@@ -1703,6 +1706,7 @@ static void show_pack_info(int stat_only)
 			  i + 1,
 			  chain_histogram[i]);
 	}
+	free(chain_histogram);
 }
 
 int cmd_index_pack(int argc, const char **argv, const char *prefix)
@@ -1932,6 +1936,7 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	if (do_fsck_object && fsck_finish(&fsck_options))
 		die(_("fsck error in pack objects"));
 
+	free(opts.anomaly);
 	free(objects);
 	strbuf_release(&index_name_buf);
 	strbuf_release(&rev_index_name_buf);