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 4.19-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-4.19 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
@@ -1380,6 +1380,7 @@ 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-4.19/media-dvb-usb-fix-memory-leak-in-dvb_usb_adapter_ini.patch
queue-4.19/tty-fix-memory-leak-in-vc_deallocate.patch
queue-4.19/media-gscpa-stv06xx-fix-memory-leak.patch
