[PATCH 10/14] describe: defensive programming

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

CodeQL points out that `lookup_commit_reference()` can return NULL
values.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 builtin/describe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/builtin/describe.c b/builtin/describe.c
index e2e73f3d757c..455ca193ebd3 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -324,6 +324,8 @@ static void describe_commit(struct object_id *oid, struct strbuf *dst)
 	unsigned int unannotated_cnt = 0;
 
 	cmit = lookup_commit_reference(the_repository, oid);
+	if (!cmit)
+		die(_("could not look up commit '%s'"), oid_to_hex(oid));
 
 	n = find_commit_name(&cmit->object.oid);
 	if (n && (tags || all || n->prio == 2)) {
-- 
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