From: Edward Adam Davis <eadavis@qq.com>
To: yanjun.zhu@linux.dev
Cc: akpm@linux-foundation.org, arjan@linux.intel.com,
davem@davemloft.net, dsahern@kernel.org, eadavis@qq.com,
edumazet@google.com, hdanton@sina.com, horms@kernel.org,
jgg@ziepe.ca, kuba@kernel.org, kuni1840@gmail.com,
kuniyu@google.com, leon@kernel.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com,
syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com,
syzkaller-bugs@googlegroups.com, zyjzyj2000@gmail.com
Subject: Re: [PATCH] RDMA/nldev: add mutual exclusion in nldev_dellink()
Date: Thu, 7 May 2026 21:40:06 +0800 [thread overview]
Message-ID: <tencent_D175A964A3A32452D77DB76B66C2B3730305@qq.com> (raw)
In-Reply-To: <3c4264e6-2e93-4121-a8ec-5ac20e5cc213@linux.dev>
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.
BR,
Edward
next prev parent reply other threads:[~2026-05-07 13:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-23 15:01 [syzbot] [net?] general protection fault in kernel_sock_shutdown (4) syzbot
2026-04-23 17:41 ` Jakub Kicinski
2026-04-24 16:47 ` Arjan van de Ven
2026-04-24 18:08 ` Arjan van de Ven
2026-05-06 13:48 ` [syzbot] [rdma] " syzbot
2026-05-06 14:28 ` Zhu Yanjun
2026-05-06 15:19 ` Kuniyuki Iwashima
2026-05-07 3:52 ` syzbot
2026-05-07 12:50 ` [PATCH] RDMA/nldev: add mutual exclusion in nldev_dellink() Edward Adam Davis
2026-05-07 13:25 ` Zhu Yanjun
2026-05-07 13:40 ` Edward Adam Davis [this message]
2026-05-07 14:11 ` Zhu Yanjun
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