Always check `parse_tree*()`'s return value
Otherwise we may easily run into serious crashes: For example, if we run
`init_tree_desc()` directly after a failed `parse_tree()`, we are
accessing uninitialized data or trying to dereference `NULL`.
Note that the `parse_tree()` function already takes care of showing an
error message. The `parse_tree_indirectly()` and
`repo_get_commit_tree()` functions do not, therefore those latter call
sites need to show a useful error message while the former do not.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/sequencer.c b/sequencer.c
index d584cac..33d12b2 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -715,6 +715,8 @@ static int do_recursive_merge(struct repository *r,
o.show_rename_progress = 1;
head_tree = parse_tree_indirect(head);
+ if (!head_tree)
+ return error(_("unable to read tree (%s)"), oid_to_hex(head));
next_tree = next ? repo_get_commit_tree(r, next) : empty_tree(r);
base_tree = base ? repo_get_commit_tree(r, base) : empty_tree(r);
@@ -3887,6 +3889,8 @@ static int do_reset(struct repository *r,
}
tree = parse_tree_indirect(&oid);
+ if (!tree)
+ return error(_("unable to read tree (%s)"), oid_to_hex(&oid));
prime_cache_tree(r, r->index, tree);
if (write_locked_index(r->index, &lock, COMMIT_LOCK) < 0)
