From: Jeff King <peff@xxxxxxxx>
Return NULL from 'get_commit_tree()' when a commit's root tree is
corrupt, doesn't exist, or points to an object which is not a tree.
In [1], this situation became a BUG(), but it can certainly occur in
cases which are not a bug in Git, for e.g., if a caller manually crafts
a commit whose tree is corrupt in any of the above ways.
Note that the expect_failure test in t6102 triggers this BUG(), but we
can't flip it to expect_success yet. Solving this problem actually
reveals a second bug.
[1]: 7b8a21dba1 (commit-graph: lazy-load trees for commits, 2018-04-06)
Co-authored-by: Taylor Blau <me@xxxxxxxxxxxx>
Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
commit.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/commit.c b/commit.c
index a5333c7ac6..e2cde566a9 100644
--- a/commit.c
+++ b/commit.c
@@ -345,10 +345,10 @@ struct tree *get_commit_tree(const struct commit *commit)
if (commit->maybe_tree || !commit->object.parsed)
return commit->maybe_tree;
- if (commit->graph_pos == COMMIT_NOT_FROM_GRAPH)
- BUG("commit has NULL tree, but was not loaded from commit-graph");
+ if (commit->graph_pos != COMMIT_NOT_FROM_GRAPH)
+ return get_commit_tree_in_graph(the_repository, commit);
- return get_commit_tree_in_graph(the_repository, commit);
+ return NULL;
}
struct object_id *get_commit_tree_oid(const struct commit *commit)
--
2.21.0.203.g358da99528
