Re: [PATCH] RDMA/nldev: add mutual exclusion in nldev_dellink()

[Zhu Yanjun <yanjun.zhu@linux.dev>]

在 2026/5/7 6:40, Edward Adam Davis 写道:
> On Thu, 7 May 2026 06:25:54 -0700, Zhu Yanjun wrote:
>>> We must serialize calls to nldev_dellink() or risk a crash as syzbot
>>> reported:
>>>
>>> KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
>>> Call Trace:
>>>    udp_tunnel_sock_release+0x6d/0x80 net/ipv4/udp_tunnel_core.c:197
>>>    rxe_release_udp_tunnel drivers/infiniband/sw/rxe/rxe_net.c:294 [inline]
>>>    rxe_sock_put drivers/infiniband/sw/rxe/rxe_net.c:639 [inline]
>>>    rxe_net_del+0xfb/0x290 drivers/infiniband/sw/rxe/rxe_net.c:660
>>>    rxe_dellink+0x15/0x20 drivers/infiniband/sw/rxe/rxe.c:254
>>>
>>> Fixes: a60e3f3d6fba ("RDMA/nldev: Add dellink function pointer")
>>> Reported-by: syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com
>>> Closes: https://syzkaller.appspot.com/bug?extid=d8f76778263ab65c2b21
>>> Tested-by: syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com
>>> Signed-off-by: Edward Adam Davis <eadavis@qq.com>
>> Thanks a lot. This looks like a good solution. Since the issue is
>> reproducible,
>>
>> have you sent this commit to syzbot for verification?
> The patch has been verified by syzbot.

Thanks a lot.

Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>

Zhu Yanjun

>
> BR,
> Edward
>
-- 
Best Regards,
Yanjun.Zhu