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Always check parse_tree*()'s return value

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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>
This commit is contained in:
Johannes Schindelin
2024-02-23 08:34:23 +00:00
committed by Junio C Hamano
parent 98c6d16d67
commit aa9f618909
12 changed files with 52 additions and 10 deletions
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5
reset.c
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@@ -158,6 +158,11 @@ int reset_head(struct repository *r, const struct reset_head_opts *opts)
}
tree = parse_tree_indirect(oid);
if (!tree) {
ret = error(_("unable to read tree (%s)"), oid_to_hex(oid));
goto leave_reset_head;
}
prime_cache_tree(r, r->index, tree);
if (write_locked_index(r->index, &lock, COMMIT_LOCK) < 0) {