From: Pavel Skripkin paskripkin@gmail.com
commit 211b4d42b70f1c1660feaa968dac0efc2a96ac4d upstream.
syzbot reported memory leak in tty/vt. The problem was in VT_DISALLOCATE ioctl cmd. After allocating unimap with PIO_UNIMAP it wasn't freed via VT_DISALLOCATE, but vc_cons[currcons].d was zeroed.
Reported-by: syzbot+bcc922b19ccc64240b42@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin paskripkin@gmail.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20210327214443.21548-1-paskripkin@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/vt/vt.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1381,6 +1381,7 @@ struct vc_data *vc_deallocate(unsigned i atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); vcs_remove_sysfs(currcons); visual_deinit(vc); + con_free_unimap(vc); put_pid(vc->vt_pid); vc_uniscr_set(vc, NULL); kfree(vc->vc_screenbuf);