lstat_cache(): print a warning if doing ping-pong between cache types

diff --git a/sha1_name.c b/sha1_name.c
index 7d95bbb27ae7485525d89281fb79f8f1fbc3da51..5d0ac0263d04d7ec72a3b7dec4aaf47aec80da5e 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -334,7 +334,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 
        /* basic@{time or number or -number} format to query ref-log */
        reflog_len = at = 0;
-       if (str[len-1] == '}') {
+       if (len && str[len-1] == '}') {
                for (at = len-2; at >= 0; at--) {
                        if (str[at] == '@' && str[at+1] == '{') {
                                reflog_len = (len-1) - (at+2);