From: Jason Gunthorpe <jgg@mellanox.com>
Date: Thu, 9 Aug 2018 20:14:44 -0600
Subject: IB/uverbs: Do not check for device disassociation during ioctl
Patch-mainline: v4.19-rc1
Git-commit: 4ce719f846a4177f2631e4149503e3baf3dce87b
References: bsc#1103992 FATE#326009
Now that the ioctl path and uobjects are converted to use uverbs_api, it
is now safe to remove the disassociation protection from the common ioctl
code.
This completes the work to make destroy functions continue to work even
after device disassociation.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/uverbs_ioctl.c | 47 +++++++++++----------------------
1 file changed, 16 insertions(+), 31 deletions(-)
--- a/drivers/infiniband/core/uverbs_ioctl.c
+++ b/drivers/infiniband/core/uverbs_ioctl.c
@@ -470,47 +470,32 @@ static int ib_uverbs_cmd_verbs(struct ib
return ret;
}
-#define IB_UVERBS_MAX_CMD_SZ 4096
-
long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ib_uverbs_file *file = filp->private_data;
struct ib_uverbs_ioctl_hdr __user *user_hdr =
(struct ib_uverbs_ioctl_hdr __user *)arg;
struct ib_uverbs_ioctl_hdr hdr;
- struct ib_device *ib_dev;
int srcu_key;
- long err;
+ int err;
+
+ if (unlikely(cmd != RDMA_VERBS_IOCTL))
+ return -ENOIOCTLCMD;
+
+ err = copy_from_user(&hdr, user_hdr, sizeof(hdr));
+ if (err)
+ return -EFAULT;
+
+ if (hdr.length > PAGE_SIZE ||
+ hdr.length != struct_size(&hdr, attrs, hdr.num_attrs))
+ return -EINVAL;
+
+ if (hdr.reserved1 || hdr.reserved2)
+ return -EPROTONOSUPPORT;
srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
- ib_dev = srcu_dereference(file->device->ib_dev,
- &file->device->disassociate_srcu);
- if (!ib_dev) {
- err = -EIO;
- goto out;
- }
-
- if (cmd == RDMA_VERBS_IOCTL) {
- err = copy_from_user(&hdr, user_hdr, sizeof(hdr));
-
- if (err || hdr.length > IB_UVERBS_MAX_CMD_SZ ||
- hdr.length != sizeof(hdr) + hdr.num_attrs * sizeof(struct ib_uverbs_attr)) {
- err = -EINVAL;
- goto out;
- }
-
- if (hdr.reserved1 || hdr.reserved2) {
- err = -EPROTONOSUPPORT;
- goto out;
- }
-
- err = ib_uverbs_cmd_verbs(file, &hdr, user_hdr->attrs);
- } else {
- err = -ENOIOCTLCMD;
- }
-out:
+ err = ib_uverbs_cmd_verbs(file, &hdr, user_hdr->attrs);
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
-
return err;
}