This is a note to let you know that I've just added the patch titled tty: fix memory leak in vc_deallocate to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tty-fix-memory-leak-in-vc_deallocate.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 211b4d42b70f1c1660feaa968dac0efc2a96ac4d Mon Sep 17 00:00:00 2001 From: Pavel Skripkin <paskripkin@xxxxxxxxx> Date: Sun, 28 Mar 2021 00:44:43 +0300 Subject: tty: fix memory leak in vc_deallocate From: Pavel Skripkin <paskripkin@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210327214443.21548-1-paskripkin@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/vt/vt.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1377,6 +1377,7 @@ 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); Patches currently in stable-queue which might be from paskripkin@xxxxxxxxx are queue-5.4/media-dvb-usb-fix-memory-leak-in-dvb_usb_adapter_ini.patch queue-5.4/tty-fix-memory-leak-in-vc_deallocate.patch queue-5.4/media-gscpa-stv06xx-fix-memory-leak.patch