On Wed, Jan 05, 2022 at 03:48:42AM -0800, Eric Dumazet wrote: > From: Eric Dumazet <edumazet@xxxxxxxxxx> > > It seems pretty clear ppp layer assumed user space > would always be kind to provide enough data > in their write() to a ppp device. > > This patch makes sure user provides at least > 2 bytes. > > It adds PPP_PROTO_LEN macro that could replace > in net-next many occurrences of hard-coded 2 value. The PPP header can be compressed to only 1 byte, but since 2 bytes is assumed in several parts of the code, rejecting such packets in ppp_xmit() is probably the best we can do. Acked-by: Guillaume Nault <gnault@xxxxxxxxxx>
