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

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Date:   Thu, 17 Mar 2022 22:58:43 -0700
From:   vdasa@...are.com
To:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     gregkh@...uxfoundation.org, pv-drivers@...are.com,
        bryantan@...are.com, rjalisatgi@...are.com,
        Vishnu Dasa <vdasa@...are.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH RESEND] VMCI: Check exclusive_vectors when freeing interrupt 1

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