wg: error on short ret reads

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/src/ipc.c b/src/ipc.c
index c8ca4311539a0523e31aa8d4e31beb5cdf9a5d10..623796115c73170ddad916250109460e07cc11c7 100644 (file)
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -179,6 +179,10 @@ static int userspace_set_device(struct wgdevice *dev)
        ret = read(fd, &ret_code, sizeof(ret_code));
        if (ret < 0)
                goto out;
+       if (ret != sizeof(ret_code)) {
+               ret = -EBADMSG;
+               goto out;
+       }
        ret = ret_code;
 out:
        close(fd);