[PATCH 19/20] commit-graph.c: prevent overflow in `write_commit_graph()`

[Taylor Blau <me@xxxxxxxxxxxx>]

In a similar spirit as previous commits, ensure that we don't overflow
when trying to read an existing OID while writing a new commit-graph.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 commit-graph.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/commit-graph.c b/commit-graph.c
index c679d1d633..20d9296c8b 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -2453,7 +2453,7 @@ int write_commit_graph(struct object_directory *odb,
 		struct commit_graph *g = ctx->r->objects->commit_graph;
 		for (i = 0; i < g->num_commits; i++) {
 			struct object_id oid;
-			oidread(&oid, g->chunk_oid_lookup + g->hash_len * i);
+			oidread(&oid, g->chunk_oid_lookup + st_mult(g->hash_len, i));
 			oid_array_append(&ctx->oids, &oid);
 		}
 	}
-- 
2.41.0.347.g7b976b8871f