net/sock: allow the user to set negative peek offset

This is necessary to allow the user to disable peeking with
offset once it's enabled.
Unix sockets already allow the above, with this patch we
permit it for udp[6] sockets, too.

Fixes: 627d2d6b5500 ("udp: enable MSG_PEEK at non-zero offset")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/sock.c b/net/core/sock.c
index 0f04d8bff607bfc7c46aa07544fb44cc02054f95..dfdd14cac775e9bfcee0085ee32ffcd0ab28b67b 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2454,9 +2454,6 @@ EXPORT_SYMBOL(__sk_mem_reclaim);
 
 int sk_set_peek_off(struct sock *sk, int val)
 {
-       if (val < 0)
-               return -EINVAL;
-
        sk->sk_peek_off = val;
        return 0;
 }