fix a potential off-by-on eerror inside udevtrigegr

coverity found this: 1330086

Signed-off-by: John Crispin <blogic@openwrt.org>

diff --git a/plug/udevtrigger.c b/plug/udevtrigger.c
index 5013189530a1741b8bfd8f3c9db85085124477f8..3eba19a681e2edee1989dfc4fc35ca85f2f9d1f6 100644 (file)
--- a/plug/udevtrigger.c
+++ b/plug/udevtrigger.c
@@ -114,7 +114,7 @@ static int sysfs_resolve_link(char *devpath, size_t size)
 
        strlcpy(link_path, "/sys", sizeof(link_path));
        strlcat(link_path, devpath, sizeof(link_path));
-       len = readlink(link_path, link_target, sizeof(link_target));
+       len = readlink(link_path, link_target, sizeof(link_target) - 1);
        if (len <= 0)
                return -1;
        link_target[len] = '\0';