diff options
| -rw-r--r-- | commit-graph.c | 14 | ||||
| -rwxr-xr-x | t/t5318-commit-graph.sh | 16 |
2 files changed, 25 insertions, 5 deletions
diff --git a/commit-graph.c b/commit-graph.c index 15afad245a..359e782dee 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -165,10 +165,20 @@ struct commit_graph *parse_commit_graph(void *graph_map, int fd, last_chunk_offset = 8; chunk_lookup = data + 8; for (i = 0; i < graph->num_chunks; i++) { - uint32_t chunk_id = get_be32(chunk_lookup + 0); - uint64_t chunk_offset = get_be64(chunk_lookup + 4); + uint32_t chunk_id; + uint64_t chunk_offset; int chunk_repeated = 0; + if (data + graph_size - chunk_lookup < + GRAPH_CHUNKLOOKUP_WIDTH) { + error(_("chunk lookup table entry missing; graph file may be incomplete")); + free(graph); + return NULL; + } + + chunk_id = get_be32(chunk_lookup + 0); + chunk_offset = get_be64(chunk_lookup + 4); + chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH; if (chunk_offset > graph_size - GIT_MAX_RAWSZ) { diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh index 5fe21db99f..694f26079f 100755 --- a/t/t5318-commit-graph.sh +++ b/t/t5318-commit-graph.sh @@ -366,9 +366,10 @@ GRAPH_OCTOPUS_DATA_OFFSET=$(($GRAPH_COMMIT_DATA_OFFSET + \ GRAPH_BYTE_OCTOPUS=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4)) GRAPH_BYTE_FOOTER=$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 * $NUM_OCTOPUS_EDGES)) -# usage: corrupt_graph_and_verify <position> <data> <string> +# usage: corrupt_graph_and_verify <position> <data> <string> [<zero_pos>] # Manipulates the commit-graph file at the position -# by inserting the data, then runs 'git commit-graph verify' +# by inserting the data, optionally zeroing the file +# starting at <zero_pos>, then runs 'git commit-graph verify' # and places the output in the file 'err'. Test 'err' for # the given string. corrupt_graph_and_verify() { @@ -376,11 +377,15 @@ corrupt_graph_and_verify() { data="${2:-\0}" grepstr=$3 cd "$TRASH_DIRECTORY/full" && + orig_size=$(wc -c < $objdir/info/commit-graph) && + zero_pos=${4:-${orig_size}} && test_when_finished mv commit-graph-backup $objdir/info/commit-graph && cp $objdir/info/commit-graph commit-graph-backup && printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc && + dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=0 && + dd if=/dev/zero of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=$(($orig_size - $zero_pos)) && test_must_fail git commit-graph verify 2>test_err && - grep -v "^+" test_err >err + grep -v "^+" test_err >err && test_i18ngrep "$grepstr" err } @@ -484,6 +489,11 @@ test_expect_success 'detect invalid checksum hash' ' "incorrect checksum" ' +test_expect_success 'detect incorrect chunk count' ' + corrupt_graph_and_verify $GRAPH_BYTE_CHUNK_COUNT "\377" \ + "chunk lookup table entry missing" $GRAPH_CHUNK_LOOKUP_OFFSET +' + test_expect_success 'git fsck (checks commit-graph)' ' cd "$TRASH_DIRECTORY/full" && git fsck && |