commit-graph: check size of commit data chunk

We expect a commit-graph file to have a fixed-size data record for each
commit in the file (and we know the number of commits to expct from the
size of the lookup table). If we encounter a file where this is too
small, we'll look past the end of the chunk (and possibly even off the
mapped memory).

We can fix this by checking the size up front when we record the
pointer.

The included test doesn't segfault, since it ends up reading bytes
from another chunk. But it produces nonsense results, since the values
it reads are garbage. Our test notices this by comparing the output to a
non-corrupted run of the same command (and of course we also check that
the expected error is printed to stderr).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index d10658de9e..492460157d 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -870,4 +870,13 @@ test_expect_success 'reader notices out-of-bounds fanout' '
 	test_cmp expect.err err
 '
 
+test_expect_success 'reader notices too-small commit data chunk' '
+	check_corrupt_chunk CDAT clear 00000000 &&
+	cat >expect.err <<-\EOF &&
+	error: commit-graph commit data chunk is wrong size
+	error: commit-graph is missing the Commit Data chunk
+	EOF
+	test_cmp expect.err err
+'
+
 test_done