Re: [PATCH v1] vhost: release memory objects in error path

[Peter Xu <peterx@redhat.com>]

On Fri, May 26, 2023 at 01:10:51PM +0530, P J P wrote:
> From: Prasad Pandit <pjp@fedoraproject.org>
> 
> vhost_dev_start function does not release memory objects in case
> of an error. This may crash the guest with:
> 
>   stack trace of thread 125653:
>   Program terminated with signal SIGSEGV, Segmentation fault
>   #0  memory_listener_register (qemu-kvm + 0x6cda0f)
>   #1  vhost_dev_start (qemu-kvm + 0x699301)
>   #2  vhost_net_start (qemu-kvm + 0x45b03f)
>   #3  virtio_net_set_status (qemu-kvm + 0x665672)
>   #4  qmp_set_link (qemu-kvm + 0x548fd5)
>   #5  net_vhost_user_event (qemu-kvm + 0x552c45)
>   #6  tcp_chr_connect (qemu-kvm + 0x88d473)
>   #7  tcp_chr_new_client (qemu-kvm + 0x88cf83)
>   #8  tcp_chr_accept (qemu-kvm + 0x88b429)
>   #9  qio_net_listener_channel_func (qemu-kvm + 0x7ac07c)
>   #10 g_main_context_dispatch (libglib-2.0.so.0 + 0x54e2f)
> 
> Release memory_listener and virtqueue objects in the error path.

IMHO it'll still good to mention that it's not event_notifier_init() that
failed but vhost_set_mem_table(), since that is probably not crystal clear.
The event_notifier_init() change is just something to fix altogether (or
with a separate patch, but this is fine by me).

Please also consider adding a "Bugzilla:" link to the original bug report.

> 
> Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>

Reviewed-by: Peter Xu <peterx@redhat.com>

Thanks!

-- 
Peter Xu