From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] vfio: fix crash on rmmod
Date: Wed, 5 Jun 2013 16:03:14 +1000 [thread overview]
Message-ID: <1370412194-32211-1-git-send-email-aik@ozlabs.ru> (raw)
devtmpfs_delete_node() calls devnode() callback with mode==NULL but
vfio still tries to write there.
The patch fixes this.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Steps to reproduce on freshly booted system with no devices given to VFIO:
modprobe vfio
rmmod vfio_iommu_spapr_tce
rmmod vfio
---
drivers/vfio/vfio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 523c121..259ad28 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1360,7 +1360,7 @@ static const struct file_operations vfio_device_fops = {
*/
static char *vfio_devnode(struct device *dev, umode_t *mode)
{
- if (MINOR(dev->devt) == 0)
+ if (mode && (MINOR(dev->devt) == 0))
*mode = S_IRUGO | S_IWUGO;
return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
--
1.7.10.4
next reply other threads:[~2013-06-05 6:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 6:03 Alexey Kardashevskiy [this message]
2013-06-05 15:11 ` [PATCH] vfio: fix crash on rmmod Alex Williamson
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