nvmet-tcp: fix a crash in nvmet_req_complete()

[ Upstream commit 0849a5441358cef02586fb2d60f707c0db195628 ]

in nvmet_tcp_handle_h2c_data_pdu(), if the host sends a data_offset
different from rbytes_done, the driver ends up calling nvmet_req_complete()
passing a status error.
The problem is that at this point cmd->req is not yet initialized,
the kernel will crash after dereferencing a NULL pointer.

Fix the bug by replacing the call to nvmet_req_complete() with
nvmet_tcp_fatal_error().

Fixes: 872d26a391da ("nvmet-tcp: add NVMe over TCP target driver")
Reviewed-by: Keith Busch <kbsuch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 3d17106..7f7fa78 100644 (file)
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -973,8 +973,7 @@ static int nvmet_tcp_handle_h2c_data_pdu(struct nvmet_tcp_queue *queue)
                        data->ttag, le32_to_cpu(data->data_offset),
                        cmd->rbytes_done);
                /* FIXME: use path and transport errors */
-               nvmet_req_complete(&cmd->req,
-                       NVME_SC_INVALID_FIELD | NVME_SC_DNR);
+               nvmet_tcp_fatal_error(queue);
                return -EPROTO;
        }