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vfio/mdev: Add missing error handling to dev_set_name()

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This can fail, and seems to be a popular target for syzkaller error
injection. Check the error return and unwind with put_device().

Fixes: 7b96953bc6 ("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>
Message-Id: <9-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Jason Gunthorpe 2021-04-06 16:40:32 -03:00 committed by Alex Williamson
parent fbd0e2b0c3
commit 18d731242d
1 changed files with 3 additions and 1 deletions
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4
drivers/vfio/mdev/mdev_core.c
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@ -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)) {