This is a note to let you know that I've just added the patch titled
nfc: fix segfault in nfc_genl_dump_devices_done
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:
nfc-fix-segfault-in-nfc_genl_dump_devices_done.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 fd79a0cbf0b2e34bcc45b13acf962e2032a82203 Mon Sep 17 00:00:00 2001
From: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>
Date: Wed, 8 Dec 2021 10:27:42 -0800
Subject: nfc: fix segfault in nfc_genl_dump_devices_done
From: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>
commit fd79a0cbf0b2e34bcc45b13acf962e2032a82203 upstream.
When kmalloc in nfc_genl_dump_devices() fails then
nfc_genl_dump_devices_done() segfaults as below
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted 5.16.0-rc4-01180-g2a987e65025e-dirty #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-6.fc35 04/01/2014
Workqueue: events netlink_sock_destruct_work
RIP: 0010:klist_iter_exit+0x26/0x80
Call Trace:
<TASK>
class_dev_iter_exit+0x15/0x20
nfc_genl_dump_devices_done+0x3b/0x50
genl_lock_done+0x84/0xd0
netlink_sock_destruct+0x8f/0x270
__sk_destruct+0x64/0x3b0
sk_destruct+0xa8/0xd0
__sk_free+0x2e8/0x3d0
sk_free+0x51/0x90
netlink_sock_destruct_work+0x1c/0x20
process_one_work+0x411/0x710
worker_thread+0x6fd/0xa80
Link: https://syzkaller.appspot.com/bug?id=fc0fa5a53db9edd261d56e74325419faf18bd0df
Reported-by: syzbot+f9f76f4a0766420b4a02@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211208182742.340542-1-tadeusz.struk@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/nfc/netlink.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -655,8 +655,10 @@ static int nfc_genl_dump_devices_done(st
{
struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
- nfc_device_iter_exit(iter);
- kfree(iter);
+ if (iter) {
+ nfc_device_iter_exit(iter);
+ kfree(iter);
+ }
return 0;
}
Patches currently in stable-queue which might be from tadeusz.struk@xxxxxxxxxx are
queue-4.19/nfc-fix-segfault-in-nfc_genl_dump_devices_done.patch
