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commit-graph: fix truncated generation numbers

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In 80c928d947 (commit-graph: simplify compute_generation_numbers(),
2023-03-20), the code to compute generation numbers was simplified to
use the same infrastructure as is used to compute topological levels.
This refactoring introduced a bug where the generation numbers are
truncated when they exceed UINT32_MAX because we explicitly cast the
computed generation number to `uint32_t`. This is not required though:
both the computed value and the field of `struct commit_graph_data` are
of the same type `timestamp_t` already, so casting to `uint32_t` will
cause truncation.

This cast can cause us to miscompute generation data overflows:

    1. Given a commit with no parents and committer date
       `UINT32_MAX + 1`.

    2. We compute its generation number as `UINT32_MAX + 1`, but
       truncate it to `1`.

    3. We calculate the generation offset via `$generation - $date`,
       which is thus `1 - (UINT32_MAX + 1)`. The computation underflows
       and we thus end up with an offset that is bigger than the maximum
       allowed offset.

As a result, we'd be writing generation data overflow information into
the commit-graph that is bogus and ultimately not even required.

Fix this bug by removing the needless cast.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2023-03-27 10:08:25 +02:00 committed by Junio C Hamano
parent cbfe360b14
commit d3af1c193d
2 changed files with 10 additions and 1 deletions
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2
commit-graph.c
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@ -1565,7 +1565,7 @@ static timestamp_t get_generation_from_graph_data(struct commit *c, void *data)
static void set_generation_v2(struct commit *c, timestamp_t t, void *data)
{
struct commit_graph_data *g = commit_graph_data_at(c);
g->generation = (uint32_t)t;
g->generation = t;
}
static void compute_generation_numbers(struct write_commit_graph_context *ctx)

9
t/t5328-commit-graph-64bit-time.sh
View File

@ -63,4 +63,13 @@ test_expect_success 'set up and verify repo with generation data overflow chunk'
graph_git_behavior 'overflow 2' repo left right
test_expect_success 'single commit with generation data exceeding UINT32_MAX' '
git init repo-uint32-max &&
cd repo-uint32-max &&
test_commit --date "@4294967297 +0000" 1 &&
git commit-graph write --reachable &&
graph_read_expect 1 "generation_data" &&
git commit-graph verify
'
test_done