validate_headref: NUL-terminate HEAD buffer

diff --git a/path.c b/path.c
index e50d2befcf826680c70ac59295c06004dd6221cf..1ca2cf9a289731174c8e7d4ff0e790e0be1d9f18 100644 (file)
--- a/path.c
+++ b/path.c
@@ -661,6 +661,10 @@ int validate_headref(const char *path)
        len = read_in_full(fd, buffer, sizeof(buffer)-1);
        close(fd);
 
+       if (len < 0)
+               return -1;
+       buffer[len] = '\0';
+
        /*
         * Is it a symbolic ref?
         */