On Mon, Feb 04, 2013 at 03:05:28PM +0000, 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.
Are there any specific drivers that cause this to happen? > Check `s->async` is non-NULL in `comedi_poll()`, `comedi_read()` and > `comedi_write()` to avoid the bug. > > Signed-off-by: Ian Abbott <[email protected]> > --- > v2: Corrected silly mistake. Deleted a line accidentally leading to > compilation failure. > Note: this is for Greg's staging-linus or master and stable kernels Can this wait until 3.9-rc1, and then backport to the 3.8.1 release and older stable kernels? thanks, greg k-h _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
