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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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6
builtin/merge-tree.c
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@ -447,12 +447,18 @@ static int real_merge(struct merge_tree_options *o,
if (repo_get_oid_treeish(the_repository, merge_base, &base_oid))
die(_("could not parse as tree '%s'"), merge_base);
base_tree = parse_tree_indirect(&base_oid);
if (!base_tree)
die(_("unable to read tree (%s)"), oid_to_hex(&base_oid));
if (repo_get_oid_treeish(the_repository, branch1, &head_oid))
die(_("could not parse as tree '%s'"), branch1);
parent1_tree = parse_tree_indirect(&head_oid);
if (!parent1_tree)
die(_("unable to read tree (%s)"), oid_to_hex(&head_oid));
if (repo_get_oid_treeish(the_repository, branch2, &merge_oid))
die(_("could not parse as tree '%s'"), branch2);
parent2_tree = parse_tree_indirect(&merge_oid);
if (!parent2_tree)
die(_("unable to read tree (%s)"), oid_to_hex(&merge_oid));
opt.ancestor = merge_base;
merge_incore_nonrecursive(&opt, base_tree, parent1_tree, parent2_tree, &result);