vhost_net: fix OoB on sendmsg() failure.
stable inclusion from stable-5.10.68 commit cad96d0e50e4149758d43bcc3bd13f6381312362 bugzilla: 182671 https://gitee.com/openeuler/kernel/issues/I4EWUH Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cad96d0e50e4149758d43bcc3bd13f6381312362 -------------------------------- commit 3c4cea8f upstream. If the sendmsg() call in vhost_tx_batch() fails, both the 'batched_xdp' and 'done_idx' indexes are left unchanged. If such failure happens when batched_xdp == VHOST_NET_BATCH, the next call to vhost_net_build_xdp() will access and write memory outside the xdp buffers area. Since sendmsg() can only error with EBADFD, this change addresses the issue explicitly freeing the XDP buffers batch on error. Fixes: 0a0be13b ("vhost_net: batch submitting XDP buffers to underlayer sockets") Suggested-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Acked-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Acked-by: NWeilong Chen <chenweilong@huawei.com> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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