linux-kernel - Re: [PATCH RESEND] VMCI: Check exclusive

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Date:   Fri, 18 Mar 2022 13:47:03 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     vdasa@...are.com
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, pv-drivers@...are.com,
        bryantan@...are.com, rjalisatgi@...are.com,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH RESEND] VMCI: Check exclusive_vectors when freeing
 interrupt 1

On Thu, Mar 17, 2022 at 10:58:43PM -0700, vdasa@...are.com wrote:
> From: Vishnu Dasa <vdasa@...are.com>
> 
> free_irq() may be called to free an interrupt that was not
> allocated.  Add missing 'if' statement to check for
> exclusive_vectors when freeing interrupt 1.
> 
> Fixes: cc68f2177fcb ("VMCI: dma dg: register dummy IRQ handlers for DMA datagrams")
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Reviewed-by: Bryan Tan <bryantan@...are.com>
> Reviewed-by: Rajesh Jalisatgi <rjalisatgi@...are.com>
> Signed-off-by: Vishnu Dasa <vdasa@...are.com>
> ---
>  drivers/misc/vmw_vmci/vmci_guest.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
> index 6596a54daa88..57a6157209a1 100644
> --- a/drivers/misc/vmw_vmci/vmci_guest.c
> +++ b/drivers/misc/vmw_vmci/vmci_guest.c
> @@ -862,7 +862,9 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
>  	return 0;
>  
>  err_free_bm_irq:
> -	free_irq(pci_irq_vector(pdev, 1), vmci_dev);
> +	if (vmci_dev->exclusive_vectors)
> +		free_irq(pci_irq_vector(pdev, 1), vmci_dev);
> +
>  err_free_irq:
>  	free_irq(pci_irq_vector(pdev, 0), vmci_dev);
>  	tasklet_kill(&vmci_dev->datagram_tasklet);
> -- 
> 2.25.1
> 

You sent the previous version 2 days before this, and 5 days before
that.  Please relax and don't start worrying unless it's been 2 weeks.

thanks,

greg k-h