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The 'ch' will be NULL in the following stack: send_notify_iov()->fuse_send_msg()->virtio_send_msg(), and this may lead to NULL pointer dereferenced in virtio_send_msg(). But send_notify_iov() was never called, so remove the useless code about send_notify_iov() to fix this problem. Signed-off-by: Alex Chen <alex.chen@huawei.com> Message-Id: <20201214121615.29967-1-alex.chen@huawei.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>