netdev - Re: [PATCH net-next] net: ipv4: guard ip_mr

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Message-Id: 
 <175110420652.2189604.6501161970436026959.git-patchwork-notify@kernel.org>
Date: Sat, 28 Jun 2025 09:50:06 +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,
 kuniyu@...gle.com, dsahern@...nel.org, netdev@...r.kernel.org,
 eric.dumazet@...il.com,
 syzbot+f02fb9e43bd85c6c66ae@...kaller.appspotmail.com, petrm@...dia.com,
 roopa@...dia.com, razor@...ckwall.org, bpoirier@...dia.com, idosch@...dia.com
Subject: Re: [PATCH net-next] net: ipv4: guard ip_mr_output() with rcu

Hello:

This patch was applied to netdev/net-next.git (main)
by David S. Miller <davem@...emloft.net>:

On Fri, 27 Jun 2025 11:46:41 +0000 you wrote:
> syzbot found at least one path leads to an ip_mr_output()
> without RCU being held.
> 
> Add guard(rcu)() to fix this in a concise way.
> 
> WARNING: CPU: 0 PID: 0 at net/ipv4/ipmr.c:2302 ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
> Call Trace:
>  <IRQ>
>   igmp_send_report+0x89e/0xdb0 net/ipv4/igmp.c:799
>  igmp_timer_expire+0x204/0x510 net/ipv4/igmp.c:-1
>   call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
>   expire_timers kernel/time/timer.c:1798 [inline]
>   __run_timers kernel/time/timer.c:2372 [inline]
>   __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
>   run_timer_base kernel/time/timer.c:2393 [inline]
>   run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
>   handle_softirqs+0x286/0x870 kernel/softirq.c:579
>   __do_softirq kernel/softirq.c:613 [inline]
>   invoke_softirq kernel/softirq.c:453 [inline]
>   __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
>   irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
>   instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
>   sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
> 
> [...]

Here is the summary with links:
  - [net-next] net: ipv4: guard ip_mr_output() with rcu
    https://git.kernel.org/netdev/net-next/c/beead7eea896

You are awesome, thank you!
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