netdev - Re: [PATCH net] net/sched: act_ife: avoid possible NULL deref

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Message-Id: 
 <176909821810.1785789.2790553125370808839.git-patchwork-notify@kernel.org>
Date: Thu, 22 Jan 2026 16:10:18 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
 jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
 netdev@...r.kernel.org, eric.dumazet@...il.com,
 syzbot+5cf914f193dffde3bd3c@...kaller.appspotmail.com, yotam.gi@...il.com
Subject: Re: [PATCH net] net/sched: act_ife: avoid possible NULL deref

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Wed, 21 Jan 2026 13:37:24 +0000 you wrote:
> tcf_ife_encode() must make sure ife_encode() does not return NULL.
> 
> syzbot reported:
> 
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
>  RIP: 0010:ife_tlv_meta_encode+0x41/0xa0 net/ife/ife.c:166
> CPU: 3 UID: 0 PID: 8990 Comm: syz.0.696 Not tainted syzkaller #0 PREEMPT(full)
> Call Trace:
>  <TASK>
>   ife_encode_meta_u32+0x153/0x180 net/sched/act_ife.c:101
>   tcf_ife_encode net/sched/act_ife.c:841 [inline]
>   tcf_ife_act+0x1022/0x1de0 net/sched/act_ife.c:877
>   tc_act include/net/tc_wrapper.h:130 [inline]
>   tcf_action_exec+0x1c0/0xa20 net/sched/act_api.c:1152
>   tcf_exts_exec include/net/pkt_cls.h:349 [inline]
>   mall_classify+0x1a0/0x2a0 net/sched/cls_matchall.c:42
>   tc_classify include/net/tc_wrapper.h:197 [inline]
>   __tcf_classify net/sched/cls_api.c:1764 [inline]
>   tcf_classify+0x7f2/0x1380 net/sched/cls_api.c:1860
>   multiq_classify net/sched/sch_multiq.c:39 [inline]
>   multiq_enqueue+0xe0/0x510 net/sched/sch_multiq.c:66
>   dev_qdisc_enqueue+0x45/0x250 net/core/dev.c:4147
>   __dev_xmit_skb net/core/dev.c:4262 [inline]
>   __dev_queue_xmit+0x2998/0x46c0 net/core/dev.c:4798
> 
> [...]

Here is the summary with links:
  - [net] net/sched: act_ife: avoid possible NULL deref
    https://git.kernel.org/netdev/net/c/27880b0b0d35

You are awesome, thank you!
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