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platform_kernel-5.15
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nvme: Don't use a stack buffer for keep-alive command 

In nvme_keep_alive() we pass a request with a pointer to an NVMe command on
the stack into blk_execute_rq_nowait().  However, the block layer doesn't
guarantee that the request is fully queued before blk_execute_rq_nowait()
returns.  If not, and the request is queued after nvme_keep_alive() returns,
then we'll end up using stack memory that might have been overwritten to
form the NVMe command we pass to hardware.

Fix this by keeping a special command struct in the nvme_ctrl struct right
next to the delayed work struct used for keep-alives.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Roland Dreier 2018-01-11 13:38:15 -08:00 committed by Sagi Grimberg
parent c3aedd225f
commit 0a34e4668c
2 changed files with 4 additions and 5 deletions
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8
drivers/nvme/host/core.c
View File

@ -796,13 +796,9 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
static int nvme_keep_alive(struct nvme_ctrl *ctrl)
{
struct nvme_command c;
struct request *rq;
memset(&c, 0, sizeof(c));
c.common.opcode = nvme_admin_keep_alive;
rq = nvme_alloc_request(ctrl->admin_q, &c, BLK_MQ_REQ_RESERVED,
rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
NVME_QID_ANY);
if (IS_ERR(rq))
return PTR_ERR(rq);
@ -834,6 +830,8 @@ void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
return;
INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}
EXPORT_SYMBOL_GPL(nvme_start_keep_alive);

1
drivers/nvme/host/nvme.h
View File

@ -183,6 +183,7 @@ struct nvme_ctrl {
struct work_struct scan_work;
struct work_struct async_event_work;
struct delayed_work ka_work;
struct nvme_command ka_cmd;
struct work_struct fw_act_work;
/* Power saving configuration */