[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH] migration/rdma: Fix cm event use after free
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH] migration/rdma: Fix cm event use after free |
Date: |
Tue, 8 Jun 2021 18:55:57 +0100 |
User-agent: |
Mutt/2.0.7 (2021-05-04) |
* Dr. David Alan Gilbert (dgilbert@redhat.com) wrote:
> * Li Zhijian (lizhijian@cn.fujitsu.com) wrote:
> > Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
>
> Thanks! I don't think I understood that 'ack' actually meant 'free'!
>
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Queued
>
> > ---
> > migration/rdma.c | 11 ++++++++---
> > 1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/migration/rdma.c b/migration/rdma.c
> > index 1cdb4561f32..d90b29a4b51 100644
> > --- a/migration/rdma.c
> > +++ b/migration/rdma.c
> > @@ -1539,16 +1539,20 @@ static int qemu_rdma_wait_comp_channel(RDMAContext
> > *rdma)
> >
> > if (pfds[1].revents) {
> > ret = rdma_get_cm_event(rdma->channel, &cm_event);
> > - if (!ret) {
> > - rdma_ack_cm_event(cm_event);
> > + if (ret) {
> > + error_report("failed to get cm event while wait "
> > + "completion channel");
> > + return -EPIPE;
> > }
> >
> > error_report("receive cm event while wait comp
> > channel,"
> > "cm event is %d", cm_event->event);
> > if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED ||
> > cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
> > + rdma_ack_cm_event(cm_event);
> > return -EPIPE;
> > }
> > + rdma_ack_cm_event(cm_event);
> > }
> > break;
> >
> > @@ -3285,7 +3289,6 @@ static void rdma_cm_poll_handler(void *opaque)
> > error_report("get_cm_event failed %d", errno);
> > return;
> > }
> > - rdma_ack_cm_event(cm_event);
> >
> > if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED ||
> > cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
> > @@ -3298,12 +3301,14 @@ static void rdma_cm_poll_handler(void *opaque)
> > rdma->return_path->error_state = -EPIPE;
> > }
> > }
> > + rdma_ack_cm_event(cm_event);
> >
> > if (mis->migration_incoming_co) {
> > qemu_coroutine_enter(mis->migration_incoming_co);
> > }
> > return;
> > }
> > + rdma_ack_cm_event(cm_event);
> > }
> >
> > static int qemu_rdma_accept(RDMAContext *rdma)
> > --
> > 2.30.2
> >
> >
> >
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK