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read-cache: make do_read_index() always set up istate->repo

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If there is no index file, e.g., because the repository has just been
created, we return zero early (unless `must_exist` makes us die
instead.)

This early return means we do not set up `istate->repo`. With
`core.untrackedCache=true`, the recent e6a653554b ("untracked-cache:
support '--untracked-files=all' if configured", 2022-03-31) will
eventually pass down `istate->repo` as a null pointer to
`repo_config_get_string()`, causing a segmentation fault.

If we do hit this early return, set up `istate->repo` similar to when we
actually read the index.

Reported-by: Joey Hess <id@joeyh.name>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Martin Ågren 2022-07-22 23:22:32 +02:00 committed by Junio C Hamano
parent e6a653554b
commit 4447d4129d
2 changed files with 9 additions and 1 deletions
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5
read-cache.c
View file

@ -2268,8 +2268,11 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
istate->timestamp.nsec = 0;
fd = open(path, O_RDONLY);
if (fd < 0) {
if (!must_exist && errno == ENOENT)
if (!must_exist && errno == ENOENT) {
if (!istate->repo)
istate->repo = the_repository;
return 0;
}
die_errno(_("%s: index file open failed"), path);
}

5
t/t7063-status-untracked-cache.sh
View file

@ -985,4 +985,9 @@ test_expect_success '"status" after file replacement should be clean with UC=fal
status_is_clean
'
test_expect_success 'empty repo (no index) and core.untrackedCache' '
git init emptyrepo &&
git -C emptyrepo -c core.untrackedCache=true write-tree
'
test_done