netdev - [PATCH] net: disable irq in napi

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Date:   Wed, 15 Feb 2023 15:20:46 +0800
From:   Kassey Li <quic_yingangl@...cinc.com>
To:     davem@...emloft.net, edumazet@...gle.com
Cc:     Kassey Li <quic_yingangl@...cinc.com>, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org
Subject: [PATCH] net: disable irq in napi_poll

There is list_del action in napi_poll, fix race condition by
disable irq.

similar report:
https://syzkaller.appspot.com/bug?id=309955e7f02812d7bfb828c22b517349d9f068
bc

list_del corruption. next->prev should be ffffff88ea0bd4c0, but was
ffffff8a787099c0
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:56!

pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __list_del_entry_valid+0xa8/0xac
lr : __list_del_entry_valid+0xa8/0xac
sp : ffffffc0081bbce0
x29: ffffffc0081bbce0 x28: 0000000000000018 x27: 0000000000000059
x26: ffffffef130c6040 x25: ffffffc0081bbcf0 x24: ffffffc0081bbd00
x23: 000000010003d37f x22: 000000000000012c x21: ffffffef130c9000
x20: ffffff8a786cf9c0 x19: ffffff88ea0bd4c0 x18: ffffffc00816d030
x17: ffffffffffffffff x16: 0000000000000004 x15: 0000000000000004
x14: ffffffef131bae30 x13: 0000000000002b84 x12: 0000000000000003
x11: 0000000100002b84 x10: c000000100002b84 x9 : 1f2ede939758e700
x8 : 1f2ede939758e700 x7 : 205b5d3330383232 x6 : 302e33303331205b
x5 : ffffffef13750358 x4 : ffffffc0081bb9df x3 : 0000000000000000
x2 : ffffff8a786be9c8 x1 : 0000000000000000 x0 : 000000000000007c

Call trace:
__list_del_entry_valid+0xa8/0xac
net_rx_action+0xfc/0x3a0
_stext+0x174/0x5f4
run_ksoftirqd+0x34/0x74
smpboot_thread_fn+0x1d8/0x464
kthread+0x168/0x1dc
ret_from_fork+0x10/0x20
Code: d4210000 f000cbc0 91161000 97de537a (d4210000)
---[ end trace 8b3858d55ee59b7c ]---
Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt

Signed-off-by: Kassey Li <quic_yingangl@...cinc.com>
---
 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index b76fb37b381e..0c677a563232 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6660,7 +6660,9 @@ static __latent_entropy void net_rx_action(struct softirq_action *h)
 		}
 
 		n = list_first_entry(&list, struct napi_struct, poll_list);
+		local_irq_disable();
 		budget -= napi_poll(n, &repoll);
+		local_irq_enable();
 
 		/* If softirq window is exhausted then punt.
 		 * Allow this to run for 2 jiffies since which will allow
-- 
2.17.1