1 files changed, 10 insertions, 0 deletions
diff --git a/refs.c b/refs.c
index 3c311d44c1..07f8847e6d 100644
--- a/refs.c
+++ b/refs.c
@@ -1297,6 +1297,16 @@ static void read_loose_refs(const char *dirname, struct ref_dir *dir)
 			if (!read_ok) {
 				hashclr(sha1);
 				flag |= REF_ISBROKEN;
+			} else if (is_null_sha1(sha1)) {
+				/*
+				 * It is so astronomically unlikely
+				 * that NULL_SHA1 is the SHA-1 of an
+				 * actual object that we consider its
+				 * appearance in a loose reference
+				 * file to be repo corruption
+				 * (probably due to a software bug).
+				 */
+				flag |= REF_ISBROKEN;
 			}
 
 			if (check_refname_format(refname.buf,