Re: [PATCH net] vsock: Fix memory leak in vmci_transport_recv_dgram_cb()

[sashiko-bot@kernel.org]

> During the closure of a datagram socket, the vmci_transport_recv_dgram_cb()
> function may be called, which will add the packets
> to the socket's backlog; then, after the receive queue is cleared,
> the __release_sock() function will move the packet back from the socket's
> backlog to the receive queue, which will lead to a memory leak.
> 
> sock_close
>   __sock_release
>     __vsock_release
>       // take ownership by user-space
>       lock_sock_nested
>       sock_set_flag(sk, SOCK_DEAD)
>       vmci_transport_release
>                                       vmci_dispatch_dgs
>                                         vmci_datagram_invoke_guest_handler
> [ ... ]
> Found by InfoTeCS on behalf of Linux Verification Center
> (linuxtesting.org) with Syzkaller.
> 
> Fixes: d021c344051a ("VSOCK: Introduce VM Sockets")
> Signed-off-by: Ilia Gavrilov <Ilia.Gavrilov@infotecs.ru>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261007143716.1984702-1-Ilia.Gavrilov@infotecs.ru?part=1