On Wed, Dec 09, 2020 at 12:07:22PM +0100, Samuel Thibault wrote: > [backport of 5.10 commit f0992098cadb4c9c6a00703b66cafe604e178fea] > > Speakup exposing a line discipline allows userland to try to use it, > while it is deemed to be useless, and thus uselessly exposes potential > bugs. One of them is simply that in such a case if the line sends data, > spk_ttyio_receive_buf2 is called and crashes since spk_ttyio_synth > is NULL. > > This change restricts the use of the speakup line discipline to > speakup drivers, thus avoiding such kind of issues altogether. > > Cc: stable@xxxxxxxxxxxxxxx > Reported-by: Shisong Qin <qinshisong1205@xxxxxxxxx> > Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx> > Tested-by: Shisong Qin <qinshisong1205@xxxxxxxxx> > Link: https://lore.kernel.org/r/20201129193523.hm3f6n5xrn6fiyyc@function > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Both of these worked, thanks! greg k-h
