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tuntap: add sanity checks about msg_controllen in sendmsg

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[ Upstream commit 74a335a07a17d131b9263bfdbdcb5e40673ca9ca ]

In patch [1], tun_msg_ctl was added to allow pass batched xdp buffers to
tun_sendmsg. Although we donot use msg_controllen in this path, we should
check msg_controllen to make sure the caller pass a valid msg_ctl.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe8dd45bb7556246c6b76277b1ba4296c91c2505

Reported-by: Eric Dumazet <[email protected]>
Suggested-by: Jason Wang <[email protected]>
Signed-off-by: Harold Huang <[email protected]>
Acked-by: Jason Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Harold Huang 2022-03-03 10:24:40 +08:00 • committed by Greg Kroah-Hartman
commit 1166f5c139
3 changed files with 5 additions and 2 deletions
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1
drivers/vhost/net.c
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@ -472,6 +472,7 @@ static void vhost_tx_batch(struct vhost_net *net,
goto signal_used;
msghdr->msg_control = &ctl;
msghdr->msg_controllen = sizeof(ctl);
err = sock->ops->sendmsg(sock, msghdr, 0);
if (unlikely(err < 0)) {
vq_err(&nvq->vq, "Fail to batch sending packets\n");