From: Sagi Grimberg sagi@grimberg.me
[ Upstream commit 25e5cb780e62bde432b401f312bb847edc78b432 ]
We cannot look at blk_rq_payload_bytes without first checking that the request has a mappable physical segments first (e.g. blk_rq_nr_phys_segments(rq) != 0) and only then to take the request payload bytes. This caused us to send a wrong sgl to the target or even dereference a non-existing buffer in case we actually got to the data send sequence (if it was in-capsule).
Reported-by: Tony Asleson tasleson@redhat.com Suggested-by: Chaitanya Kulkarni Chaitanya.Kulkarni@wdc.com Signed-off-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Keith Busch kbusch@kernel.org Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/tcp.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 244984420b41b..11e84ed4de361 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -164,16 +164,14 @@ static inline bool nvme_tcp_async_req(struct nvme_tcp_request *req) static inline bool nvme_tcp_has_inline_data(struct nvme_tcp_request *req) { struct request *rq; - unsigned int bytes;
if (unlikely(nvme_tcp_async_req(req))) return false; /* async events don't have a request */
rq = blk_mq_rq_from_pdu(req); - bytes = blk_rq_payload_bytes(rq);
- return rq_data_dir(rq) == WRITE && bytes && - bytes <= nvme_tcp_inline_data_size(req->queue); + return rq_data_dir(rq) == WRITE && req->data_len && + req->data_len <= nvme_tcp_inline_data_size(req->queue); }
static inline struct page *nvme_tcp_req_cur_page(struct nvme_tcp_request *req) @@ -2090,7 +2088,9 @@ static blk_status_t nvme_tcp_map_data(struct nvme_tcp_queue *queue,
c->common.flags |= NVME_CMD_SGL_METABUF;
- if (rq_data_dir(rq) == WRITE && req->data_len && + if (!blk_rq_nr_phys_segments(rq)) + nvme_tcp_set_sg_null(c); + else if (rq_data_dir(rq) == WRITE && req->data_len <= nvme_tcp_inline_data_size(queue)) nvme_tcp_set_sg_inline(queue, c, req->data_len); else @@ -2117,7 +2117,8 @@ static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns, req->data_sent = 0; req->pdu_len = 0; req->pdu_sent = 0; - req->data_len = blk_rq_payload_bytes(rq); + req->data_len = blk_rq_nr_phys_segments(rq) ? + blk_rq_payload_bytes(rq) : 0; req->curr_bio = rq->bio;
if (rq_data_dir(rq) == WRITE &&