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nvmet-tcp: fix a crash in nvmet_req_complete()

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[ 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: 872d26a391 ("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>
This commit is contained in:
Maurizio Lombardi 2023-12-22 16:17:49 +01:00 committed by Greg Kroah-Hartman
parent ee5e7632e9
commit 9638beb4e1
1 changed files with 1 additions and 2 deletions
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3
drivers/nvme/target/tcp.c
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@ -886,8 +886,7 @@ 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;
}