sha1-name: do not assume that the ref store is initialized

c931ba4e (sha1-name.c: remove the_repo from handle_one_ref(),
2019-04-16) replaced the use of for_each_ref() helper, which works
with the main ref store of the default repository instance, with
refs_for_each_ref(), which can work on any ref store instance, by
assuming that the repository instance the function is given has its
ref store already initialized.

But it is possible that nobody has initialized it, in which case,
the code ends up dereferencing a NULL pointer.

Reported-by: Érico Rolim <erico.erc@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/t/t4208-log-magic-pathspec.sh b/t/t4208-log-magic-pathspec.sh
index 4c8f3b8e1b..6cdbe4747a 100755
--- a/t/t4208-log-magic-pathspec.sh
+++ b/t/t4208-log-magic-pathspec.sh
@@ -55,6 +55,10 @@ test_expect_success '"git log -- :/a" should not be ambiguous' '
 	git log -- :/a
 '
 
+test_expect_success '"git log :/any/path/" should not segfault' '
+	test_must_fail git log :/any/path/
+'
+
 # This differs from the ":/a" check above in that :/in looks like a pathspec,
 # but doesn't match an actual file.
 test_expect_success '"git log :/in" should not be ambiguous' '