6.12-stable review patch. If anyone has any objections, please let me know.
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From: Hannes Reinecke hare@kernel.org
[ Upstream commit 0bf04c874fcb1ae46a863034296e4b33d8fbd66c ]
Validate the request in nvme_tcp_handle_r2t() to ensure it's not part of any list, otherwise a malicious R2T PDU might inject a loop in request list processing.
Signed-off-by: Hannes Reinecke hare@kernel.org Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/tcp.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 13ede6e309092..25e486e6e8054 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -453,7 +453,8 @@ nvme_tcp_fetch_request(struct nvme_tcp_queue *queue) return NULL; }
- list_del(&req->entry); + list_del_init(&req->entry); + init_llist_node(&req->lentry); return req; }
@@ -561,6 +562,8 @@ static int nvme_tcp_init_request(struct blk_mq_tag_set *set, req->queue = queue; nvme_req(rq)->ctrl = &ctrl->ctrl; nvme_req(rq)->cmd = &pdu->cmd; + init_llist_node(&req->lentry); + INIT_LIST_HEAD(&req->entry);
return 0; } @@ -765,6 +768,14 @@ static int nvme_tcp_handle_r2t(struct nvme_tcp_queue *queue, return -EPROTO; }
+ if (llist_on_list(&req->lentry) || + !list_empty(&req->entry)) { + dev_err(queue->ctrl->ctrl.device, + "req %d unexpected r2t while processing request\n", + rq->tag); + return -EPROTO; + } + req->pdu_len = 0; req->h2cdata_left = r2t_length; req->h2cdata_offset = r2t_offset; @@ -2599,6 +2610,8 @@ static void nvme_tcp_submit_async_event(struct nvme_ctrl *arg) ctrl->async_req.offset = 0; ctrl->async_req.curr_bio = NULL; ctrl->async_req.data_len = 0; + init_llist_node(&ctrl->async_req.lentry); + INIT_LIST_HEAD(&ctrl->async_req.entry);
nvme_tcp_queue_request(&ctrl->async_req, true, true); }