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nvmet: fix a use-after-free 

Fix the following use-after-free complaint triggered by blktests nvme/004:

BUG: KASAN: user-memory-access in blk_mq_complete_request_remote+0xac/0x350
Read of size 4 at addr 0000607bd1835943 by task kworker/13:1/460
Workqueue: nvmet-wq nvme_loop_execute_work [nvme_loop]
Call Trace:
 show_stack+0x52/0x58
 dump_stack_lvl+0x49/0x5e
 print_report.cold+0x36/0x1e2
 kasan_report+0xb9/0xf0
 __asan_load4+0x6b/0x80
 blk_mq_complete_request_remote+0xac/0x350
 nvme_loop_queue_response+0x1df/0x275 [nvme_loop]
 __nvmet_req_complete+0x132/0x4f0 [nvmet]
 nvmet_req_complete+0x15/0x40 [nvmet]
 nvmet_execute_io_connect+0x18a/0x1f0 [nvmet]
 nvme_loop_execute_work+0x20/0x30 [nvme_loop]
 process_one_work+0x56e/0xa70
 worker_thread+0x2d1/0x640
 kthread+0x183/0x1c0
 ret_from_fork+0x1f/0x30

Cc: stable@vger.kernel.org
Fixes: a07b4970f4 ("nvmet: add a generic NVMe target")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Bart Van Assche 2022-08-12 14:03:17 -07:00 committed by Christoph Hellwig
parent 748008e1da
commit 6a02a61e81
1 changed files with 4 additions and 2 deletions
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6
drivers/nvme/target/core.c
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@ -735,6 +735,8 @@ static void nvmet_set_error(struct nvmet_req *req, u16 status)
static void __nvmet_req_complete(struct nvmet_req *req, u16 status) static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
{ {
struct nvmet_ns *ns = req->ns;
if (!req->sq->sqhd_disabled) if (!req->sq->sqhd_disabled)
nvmet_update_sq_head(req); nvmet_update_sq_head(req);
req->cqe->sq_id = cpu_to_le16(req->sq->qid); req->cqe->sq_id = cpu_to_le16(req->sq->qid);
@ -745,9 +747,9 @@ static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
trace_nvmet_req_complete(req); trace_nvmet_req_complete(req);
if (req->ns)
nvmet_put_namespace(req->ns);
req->ops->queue_response(req); req->ops->queue_response(req);
if (ns)
nvmet_put_namespace(ns);
} }
void nvmet_req_complete(struct nvmet_req *req, u16 status) void nvmet_req_complete(struct nvmet_req *req, u16 status)