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Message-Id: <20240116113426.909-1-hdanton@sina.com>
Date: Tue, 16 Jan 2024 19:34:26 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+7ec955e36bb239bd720f@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dsa_user_prechangeupper
On Mon, 15 Jan 2024 13:43:20 -0800
> syzbot found the following issue on:
>
> HEAD commit: 3e7aeb78ab01 Merge tag 'net-next-6.8' of git://git.kernel...
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12995b33e80000
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
--- x/net/dsa/user.c
+++ y/net/dsa/user.c
@@ -2865,11 +2865,13 @@ static int dsa_user_changeupper(struct n
static int dsa_user_prechangeupper(struct net_device *dev,
struct netdev_notifier_changeupper_info *info)
{
- struct dsa_port *dp = dsa_user_to_port(dev);
+ struct dsa_port *dp;
if (!dsa_user_dev_check(dev))
return NOTIFY_DONE;
+ dp = dsa_user_to_port(dev);
+
if (netif_is_bridge_master(info->upper_dev) && !info->linking)
dsa_port_pre_bridge_leave(dp, info->upper_dev);
else if (netif_is_lag_master(info->upper_dev) && !info->linking)
--
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