lock_any_ref_for_update(): do not accept malformatted refs.

We used to use lock_any_ref_for_update() because the command
needs to also update HEAD (which is not under refs/, so
lock_ref_sha1() cannot be used).  The function however did not
check for refs with illegal characters in them.

Use check_ref_format() to catch malformed refs.  For this check,
we specifically do not want to say having less than two levels
in the name is illegal to allow HEAD (and perhaps other special
refs in the future).

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/refs.c b/refs.c
index 12e46b8bb..3db444cad 100644
--- a/refs.c
+++ b/refs.c
@@ -710,6 +710,8 @@ struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
 
 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
 {
+	if (check_ref_format(ref) == -1)
+		return NULL;
 	return lock_ref_sha1_basic(ref, old_sha1, NULL);
 }