reject @{-1} not at beginning of object name

[git.git] / sha1_name.c

diff --git a/sha1_name.c b/sha1_name.c
index 00fc4151780a4e66b70a78ac30d4798ad69b976e..77299257bf3aa91079d5b883c6676afa6fd2d01c 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -399,6 +399,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
                unsigned long co_time;
                int co_tz, co_cnt;
 
+               /* a @{-N} placed anywhere except the start is an error */
+               if (str[at+2] == '-')
+                       return -1;
+
                /* Is it asking for N-th entry, or approxidate? */
                for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
                        char ch = str[at+2+i];