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From: Jakub Kicinski <kuba@kernel.org>
To: Weiming Shi <bestswngs@gmail.com>
Cc: Allison Henderson <allison.henderson@oracle.com>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
	netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
	Xiang Mei <xmei5@asu.edu>
Subject: Re: [PATCH net] rds: ib: reject FRMR registration before IB connection is established
Date: Tue, 31 Mar 2026 19:26:33 -0700	[thread overview]
Message-ID: <20260331192633.26144848@kernel.org> (raw)
In-Reply-To: <20260330163237.2752440-2-bestswngs@gmail.com>

On Tue, 31 Mar 2026 00:32:38 +0800 Weiming Shi wrote:
> rds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data
> and passes it to rds_ib_reg_frmr() for FRWR memory registration. On a
> fresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with
> i_cm_id = NULL because the connection worker has not yet called
> rds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with
> RDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses
> the control message before any connection establishment, allowing
> rds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the
> kernel.

Allison?

  reply	other threads:[~2026-04-01  2:26 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-30 16:32 [PATCH net] rds: ib: reject FRMR registration before IB connection is established Weiming Shi
2026-04-01  2:26 ` Jakub Kicinski [this message]
2026-04-02  0:36 ` Allison Henderson
2026-04-02  2:00 ` patchwork-bot+netdevbpf

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