[PATCH] cxlflash: return -EFAULT if copy_from_user() fails

[Dan Carpenter]

The copy_from/to_user() functions return the number of bytes remaining
to be copied but we had intended to return -EFAULT here.

Fixes: bc88ac47d5cb ("scsi: cxlflash: Support AFU debug")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 7a787b6e21c4..56b6e294ab78 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -3415,9 +3415,10 @@ static int cxlflash_afu_debug(struct cxlflash_cfg *cfg,
                if (is_write) {
                        req_flags |= SISL_REQ_FLAGS_HOST_WRITE;
 
-                       rc = copy_from_user(kbuf, ubuf, ulen);
-                       if (unlikely(rc))
+                       if (copy_from_user(kbuf, ubuf, ulen)) {
+                               rc = -EFAULT;
                                goto out;
+                       }
                }
        }
 
@@ -3445,8 +3446,10 @@ static int cxlflash_afu_debug(struct cxlflash_cfg *cfg,
                goto out;
        }
 
-       if (ulen && !is_write)
-               rc = copy_to_user(ubuf, kbuf, ulen);
+       if (ulen && !is_write) {
+               if (copy_to_user(ubuf, kbuf, ulen))
+                       rc = -EFAULT;
+       }
 out:
        kfree(buf);
        dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);