linux-kernel - [patch 1/3] vfio: signedness bug in vfio_config_do

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Date:	Thu, 28 Jun 2012 09:44:25 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch 1/3] vfio: signedness bug in vfio_config_do_rw()

The "count" variable is unsigned here so the test for errors doesn't
work.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index a4f7321..10bc6a8 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1487,7 +1487,7 @@ static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf,
 		if (perm->readfn) {
 			count = perm->readfn(vdev, *ppos, count,
 					     perm, offset, &val);
-			if (count < 0)
+			if ((ssize_t)count < 0)
 				return count;
 		}
 
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