Re: [PATCH QEMU HCI-8.1 v3 05/28] hw/vfio: Fix liveness check in vfio_connect_kvm_msi_virq()

[no-reply@sashiko.virtuozzo.com]

> From: "Tycho Andersen (AMD)" <tycho@kernel.org>
> 
> While working on savevm/loadvm for a new vfio device, I encountered the
> crash below. Since vfio_connect_kvm_msi_virq() didn't check the ->use flag
> for the vector, it would pass an unused vector down to
> vfio_cpr_load_vector_fd() which would crash.
> 
> Fix this by checking the ->use flag along with the virq number to detect
> whether a vector is valid or not.
> 
> Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
> 0x0000555555a891ef in vfio_cpr_load_vector_fd (vdev=vdev@entry=0x0,
>     name=name@entry=0x555555eeb27e "kvm_interrupt", nr=nr@entry=1) at ../hw/vfio/cpr.c:44
> 44	    g_autofree char *fdname = STRDUP_VECTOR_FD_NAME(vdev, name);
> (gdb) bt
> [ ... ]
> Fixes: 30edcb4d4e7a ("vfio-pci: preserve MSI")
> Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
> Reviewed-by: Cédric Le Goater <clg@redhat.com>
> Link: https://lore.kernel.org/qemu-devel/20260727150038.2684512-1-tycho@kernel.org
> Signed-off-by: Cédric Le Goater <clg@redhat.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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