netdev - Re: CAKE and r8169 cause panic on upload in v4.19

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Date:   Sun, 28 Oct 2018 10:45:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     oleksandr@...alenko.name
Cc:     dave.taht@...il.com, hkallweit1@...il.com, toke@...e.dk,
        jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: CAKE and r8169 cause panic on upload in v4.19

From: Oleksandr Natalenko <oleksandr@...alenko.name>
Date: Sun, 28 Oct 2018 13:22:09 +0100

> Hi.
> 
> On 28.10.2018 05:44, David Miller wrote:
>> Does this fix it?
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 022ad73d6253..77d43ae2a7bb 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -5457,7 +5457,7 @@ static void gro_flush_oldest(struct list_head
>> *head)
>>  	/* Do not adjust napi->gro_hash[].count, caller is adding a new
>>  	 * SKB to the chain.
>>  	 */
>> -	list_del(&oldest->list);
>> +	skb_list_del_init(oldest);
>>  	napi_gro_complete(oldest);
>>  }
> 
> Yes, but I had to apply both a8305bff6852 and 992cba7e276d too to get
> it compiled. With these 3 patches the panic is not triggered any more
> while having GRO enabled.
> 
> Thanks!

Thanks for testing, I'll queue this up for -stable too:

>From ece23711dd956cd5053c9cb03e9fe0668f9c8894 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@...emloft.net>
Date: Sun, 28 Oct 2018 10:35:12 -0700
Subject: [PATCH] net: Properly unlink GRO packets on overflow.

Just like with normal GRO processing, we have to initialize
skb->next to NULL when we unlink overflow packets from the
GRO hash lists.

Fixes: d4546c2509b1 ("net: Convert GRO SKB handling to list_head.")
Reported-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 022ad73d6253..77d43ae2a7bb 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5457,7 +5457,7 @@ static void gro_flush_oldest(struct list_head *head)
 	/* Do not adjust napi->gro_hash[].count, caller is adding a new
 	 * SKB to the chain.
 	 */
-	list_del(&oldest->list);
+	skb_list_del_init(oldest);
 	napi_gro_complete(oldest);
 }
 
-- 
2.17.2