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Message-Id: <20240308105058.1649-1-hdanton@sina.com>
Date: Fri, 8 Mar 2024 18:50:58 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+e5167d7144a62715044c@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in ip_skb_dst_mtu
On Wed, 06 Mar 2024 02:57:18 -0800
> syzbot found the following issue on:
>
> HEAD commit: 805d849d7c3c Merge tag 'acpi-6.8-rc7' of git://git.kernel...
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1025fa6a180000
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
--- x/drivers/net/ipvlan/ipvlan_core.c
+++ y/drivers/net/ipvlan/ipvlan_core.c
@@ -426,6 +426,7 @@ static noinline_for_stack int ipvlan_pro
.daddr = ip4h->daddr,
.saddr = ip4h->saddr,
};
+ struct sock *sk;
rt = ip_route_output_flow(net, &fl4, NULL);
if (IS_ERR(rt))
@@ -439,7 +440,10 @@ static noinline_for_stack int ipvlan_pro
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+ sk = skb->sk;
+ refcount_inc(&sk->sk_wmem_alloc);
err = ip_local_out(net, skb->sk, skb);
+ sk_free(sk);
if (unlikely(net_xmit_eval(err)))
DEV_STATS_INC(dev, tx_errors);
else
--
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