commit-graph: verify corrupt OID fanout and lookup

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index dc16849ddd5530287768123391e0d3e692489ad8..8ae2a49cfa1d557113379de40c2eb72096a8dcaf 100755 (executable)
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -247,6 +247,7 @@ test_expect_success 'git commit-graph verify' '
        git commit-graph verify >output
 '
 
+HASH_LEN=20
 GRAPH_BYTE_VERSION=4
 GRAPH_BYTE_HASH=5
 GRAPH_BYTE_CHUNK_COUNT=6
@@ -258,6 +259,12 @@ GRAPH_BYTE_OID_LOOKUP_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
                            1 * $GRAPH_CHUNK_LOOKUP_WIDTH))
 GRAPH_BYTE_COMMIT_DATA_ID=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
                             2 * $GRAPH_CHUNK_LOOKUP_WIDTH))
+GRAPH_FANOUT_OFFSET=$(($GRAPH_CHUNK_LOOKUP_OFFSET + \
+                      $GRAPH_CHUNK_LOOKUP_WIDTH * $GRAPH_CHUNK_LOOKUP_ROWS))
+GRAPH_BYTE_FANOUT1=$(($GRAPH_FANOUT_OFFSET + 4 * 4))
+GRAPH_BYTE_FANOUT2=$(($GRAPH_FANOUT_OFFSET + 4 * 255))
+GRAPH_OID_LOOKUP_OFFSET=$(($GRAPH_FANOUT_OFFSET + 4 * 256))
+GRAPH_BYTE_OID_LOOKUP_ORDER=$(($GRAPH_OID_LOOKUP_OFFSET + $HASH_LEN * 8))
 
 # usage: corrupt_graph_and_verify <position> <data> <string>
 # Manipulates the commit-graph file at the position
@@ -312,4 +319,19 @@ test_expect_success 'detect missing commit data chunk' '
                "missing the Commit Data chunk"
 '
 
+test_expect_success 'detect incorrect fanout' '
+       corrupt_graph_and_verify $GRAPH_BYTE_FANOUT1 "\01" \
+               "fanout value"
+'
+
+test_expect_success 'detect incorrect fanout final value' '
+       corrupt_graph_and_verify $GRAPH_BYTE_FANOUT2 "\01" \
+               "fanout value"
+'
+
+test_expect_success 'detect incorrect OID order' '
+       corrupt_graph_and_verify $GRAPH_BYTE_OID_LOOKUP_ORDER "\01" \
+               "incorrect OID order"
+'
+
 test_done