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-rw-r--r--sha1_name.c4
-rwxr-xr-xt/t1508-at-combinations.sh2
2 files changed, 5 insertions, 1 deletions
diff --git a/sha1_name.c b/sha1_name.c
index 00fc415178..77299257bf 100644
--- 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];
diff --git a/t/t1508-at-combinations.sh b/t/t1508-at-combinations.sh
index 2a46af24d6..d5d6244178 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -45,7 +45,7 @@ check "@{u}" upstream-two
check "@{u}@{1}" upstream-one
check "@{-1}@{u}" master-two
check "@{-1}@{u}@{1}" master-one
-fail nonsense "@{u}@{-1}"
+nonsense "@{u}@{-1}"
nonsense "@{1}@{u}"
test_done