On 2013-02-04 14:56, Ian Abbott wrote:
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@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
Note: This version of the patch is for Greg's staging-linus branch or
the master branch and for stable kernels.
Please ignore this one. I f'ed up.
---
drivers/staging/comedi/comedi_fops.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 9b038e4..4898980 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1774,7 +1774,7 @@ 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
@@ -1784,7 +1784,7 @@ 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);
@@ -1826,11 +1826,10 @@ 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;
}
- async = s->async;
Oops, i didn't mean to delete that!
if (!nbytes) {
retval = 0;
@@ -1937,7 +1936,7 @@ 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;
}
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
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