libnvdimm: smatch cleanups in __nd_ioctl

Drop use of access_ok() since we are already using copy_{to|from}_user()
which do their own access_ok().

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 8eb22c0..73442bd 100644 (file)
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -535,8 +535,6 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
                                        __func__, dimm_name, cmd_name, i);
                        return -ENXIO;
                }
-               if (!access_ok(VERIFY_READ, p + in_len, in_size))
-                       return -EFAULT;
                if (in_len < sizeof(in_env))
                        copy = min_t(u32, sizeof(in_env) - in_len, in_size);
                else
@@ -557,8 +555,6 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
                                        __func__, dimm_name, cmd_name, i);
                        return -EFAULT;
                }
-               if (!access_ok(VERIFY_WRITE, p + in_len + out_len, out_size))
-                       return -EFAULT;
                if (out_len < sizeof(out_env))
                        copy = min_t(u32, sizeof(out_env) - out_len, out_size);
                else
@@ -570,9 +566,6 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
        }
 
        buf_len = out_len + in_len;
-       if (!access_ok(VERIFY_WRITE, p, sizeof(buf_len)))
-               return -EFAULT;
-
        if (buf_len > ND_IOCTL_MAX_BUFLEN) {
                dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
                                dimm_name, cmd_name, buf_len,