staging: comedi: check s->async for poll(), read() and write()

commit cc400e185c07c15a42d2635995f422de5b94b696 upstream.

Some low-level comedi drivers (incorrectly) point `dev->read_subdev` or
`dev->write_subdev` to a subdevice that does not support asynchronous
commands.  Comedi's poll(), read() and write() file operation handlers
assume these subdevices do support asynchronous commands.  In
particular, they assume `s->async` is valid (where `s` points to the
read or write subdevice), which it won't be if it has been set
incorrectly.  This can lead to a NULL pointer dereference.

Check `s->async` is non-NULL in `comedi_poll()`, `comedi_read()` and
`comedi_write()` to avoid the bug.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 13e79a1..a023f52 100644 (file)
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1574,7 +1574,7 @@ static unsigned int comedi_poll(struct file *file, poll_table * wait)
 
        mask = 0;
        read_subdev = comedi_get_read_subdevice(dev_file_info);
-       if (read_subdev) {
+       if (read_subdev && read_subdev->async) {
                poll_wait(file, &read_subdev->async->wait_head, wait);
                if (!read_subdev->busy
                    || comedi_buf_read_n_available(read_subdev->async) > 0
@@ -1584,7 +1584,7 @@ static unsigned int comedi_poll(struct file *file, poll_table * wait)
                }
        }
        write_subdev = comedi_get_write_subdevice(dev_file_info);
-       if (write_subdev) {
+       if (write_subdev && write_subdev->async) {
                poll_wait(file, &write_subdev->async->wait_head, wait);
                comedi_buf_write_alloc(write_subdev->async,
                                       write_subdev->async->prealloc_bufsz);
@@ -1626,7 +1626,7 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
        }
 
        s = comedi_get_write_subdevice(dev_file_info);
-       if (s == NULL) {
+       if (s == NULL || s->async == NULL) {
                retval = -EIO;
                goto done;
        }
@@ -1737,7 +1737,7 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
        }
 
        s = comedi_get_read_subdevice(dev_file_info);
-       if (s == NULL) {
+       if (s == NULL || s->async == NULL) {
                retval = -EIO;
                goto done;
        }