Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in __tcp_transmit_skb

[Karsten Graul]

On 24/03/2022 02:41, Eric Dumazet wrote:
> On Wed, Mar 23, 2022 at 5:13 PM syzbot
> <syzbot+090d23ddbd5cd185c2e0@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    36c2e31ad25b net: geneve: add missing netlink policy and s..
>> git tree:       net-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17c308a5700000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=4a15e2288cf165c9
>> dashboard link: https://syzkaller.appspot.com/bug?extid=090d23ddbd5cd185c2e0
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=171eadbd700000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12cacda3700000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+090d23ddbd5cd185c2e0@xxxxxxxxxxxxxxxxxxxxxxxxx
>>
> 
> AF_SMC does not handle TCP_REPAIR properly.
> 
> Look at commit d9e4c129181004e ("mptcp: only admit explicitly
> supported sockopt") for an equivalent bug/fix.

Got it, we will fix that.