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

[Zhu Yanjun]

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@xxxxxxxxxxxxxxxxxxxxxxxxx
> > > Closes: https://syzkaller.appspot.com/bug?extid=d8f76778263ab65c2b21
> > > Tested-by: syzbot+d8f76778263ab65c2b21@xxxxxxxxxxxxxxxxxxxxxxxxx
> > > Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
> > 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@xxxxxxxxx>

Zhu Yanjun

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