diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_fops.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 452121b6a604..0ed6f1f00e7f 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2075,6 +2075,10 @@ static ssize_t comedi_write(struct file *file, const char __user *buf, retval = -EACCES; goto out; } + if (!(async->cmd.flags & CMDF_WRITE)) { + retval = -EINVAL; + goto out; + } add_wait_queue(&async->wait_head, &wait); on_wait_queue = true; @@ -2146,6 +2150,10 @@ static ssize_t comedi_write(struct file *file, const char __user *buf, retval = -EACCES; break; } + if (!(async->cmd.flags & CMDF_WRITE)) { + retval = -EINVAL; + break; + } continue; } |