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[v2,09/18] vfio/mdev: Add missing error handling to dev_set_name()

Message ID 9-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com (mailing list archive)
State New, archived
Headers show
Series Make vfio_mdev type safe | expand

Commit Message

Jason Gunthorpe April 6, 2021, 7:40 p.m. UTC 
This can fail, and seems to be a popular target for syzkaller error
injection. Check the error return and unwind with put_device().

Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index f7559835b0610f..4caedb3d4fbf32 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -258,7 +258,9 @@  int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 	list_add(&mdev->next, &mdev_list);
 	mutex_unlock(&mdev_list_lock);
 
-	dev_set_name(&mdev->dev, "%pUl", uuid);
+	ret = dev_set_name(&mdev->dev, "%pUl", uuid);
+	if (ret)
+		goto out_put_device;
 
 	/* Check if parent unregistration has started */
 	if (!down_read_trylock(&parent->unreg_sem)) {