[lvc-project] [PATCH net] pppoe: Fix memory leak in pppoe_sendmsg()

[Guillaume Nault]

On Wed, Feb 14, 2024 at 09:01:50AM +0000, Gavrilov Ilia wrote:
> syzbot reports a memory leak in pppoe_sendmsg [1].
> 
> The problem is in the pppoe_recvmsg() function that handles errors
> in the wrong order. For the skb_recv_datagram() function, check
> the pointer to skb for NULL first, and then check the 'error' variable,
> because the skb_recv_datagram() function can set 'error'
> to -EAGAIN in a loop but return a correct pointer to socket buffer
> after a number of attempts, though 'error' remains set to -EAGAIN.

Reviewed-by: Guillaume Nault <gnault at redhat.com>