[PATCH] KVM: PPC: Book3S HV: Set irqfd->producer only on success

[leixiang]

Set irqfd->producer only after kvmppc_set_passthru_irq() succeeds to
avoid leaving a dangling pointer on failure. The bypass manager does
not register a failed producer, so the pointer is never cleared.

Fixes: c57875f5f9be ("KVM: PPC: Book3S HV: Enable IRQ bypass")
Suggested-by: Sean Christopherson <sea...@google.com>
Cc: sta...@vger.kernel.org
Signed-off-by: leixiang <leixi...@kylinos.cn>
---
 arch/powerpc/kvm/book3s_hv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 61dbeea317f3..ff7b25629125 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -6111,12 +6111,12 @@ static int kvmppc_irq_bypass_add_producer_hv(struct 
irq_bypass_consumer *cons,
        struct kvm_kernel_irqfd *irqfd =
                container_of(cons, struct kvm_kernel_irqfd, consumer);
 
-       irqfd->producer = prod;
-
        ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
        if (ret)
                pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
                        prod->irq, irqfd->gsi, ret);
+       else
+               irqfd->producer = prod;
 
        return ret;
 }
-- 
2.45.0