Make sure the resutl from readlink is properly null terminated

diff --git a/src/drivers/linux_ioctl.c b/src/drivers/linux_ioctl.c
index f8061670aa99f24f8ef1fbb579702a562477998f..0d6cf5416beec1144b2a3d8aaba1bb987d7c87ed 100644 (file)
--- a/src/drivers/linux_ioctl.c
+++ b/src/drivers/linux_ioctl.c
@@ -186,7 +186,8 @@ int linux_br_get(char *brname, const char *ifname)
        char path[128], brlink[128], *pos;
        os_snprintf(path, sizeof(path), "/sys/class/net/%s/brport/bridge",
                    ifname);
-       if (readlink(path, brlink, sizeof(brlink)) < 0)
+       os_memset(brlink, 0, sizeof(brlink));
+       if (readlink(path, brlink, sizeof(brlink) - 1) < 0)
                return -1;
        pos = os_strrchr(brlink, '/');
        if (pos == NULL)