* Obtain the data to be sent to the device (if any).
*/
- if(copy_from_user(buf, cmd_in + cmdlen, inlen))
+ if(inlen && copy_from_user(buf, cmd_in + cmdlen, inlen))
goto error;
switch (opcode) {
if (copy_to_user(cmd_in, sense, sb_len))
result = -EFAULT;
} else {
- if (copy_to_user(cmd_in, buf, outlen))
+ if (outlen && copy_to_user(cmd_in, buf, outlen))
result = -EFAULT;
}