diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2021-12-08 15:35:06 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-12-08 16:36:58 +0100 |
| commit | 30e32f300be6d0160fd1b3fc6d0f62917acd9be2 (patch) | |
| tree | 9a1482fcff0fe270246b69859ac3ad601c38e16d /drivers/nvme | |
| parent | 8b77fa6fdce0fc7147bab91b1011048758290ca4 (diff) | |
nvmet-tcp: fix possible list corruption for unexpected command failure
nvmet_tcp_handle_req_failure needs to understand weather to prepare
for incoming data or the next pdu. However if we misidentify this, we
will wait for 0-length data, and queue the response although nvmet_req_init
already did that.
The particular command was namespace management command with no data,
which was incorrectly categorized as a command with incapsule data.
Also, add a code comment of what we are trying to do here.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/target/tcp.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index cb6a473c3eaf..7c1c43ce466b 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -922,7 +922,14 @@ static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue, size_t data_len = le32_to_cpu(req->cmd->common.dptr.sgl.length); int ret; - if (!nvme_is_write(cmd->req.cmd) || + /* + * This command has not been processed yet, hence we are trying to + * figure out if there is still pending data left to receive. If + * we don't, we can simply prepare for the next pdu and bail out, + * otherwise we will need to prepare a buffer and receive the + * stale data before continuing forward. + */ + if (!nvme_is_write(cmd->req.cmd) || !data_len || data_len > cmd->req.port->inline_data_size) { nvmet_prepare_receive_pdu(queue); return; |