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| author | Jianchao Wang <jianchao.w.wang@oracle.com> | 2018-02-12 13:54:44 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-03-26 16:53:43 +0200 |
| commit | 6f8e0d787e3727ed70116e3523f4ecb86887c000 (patch) | |
| tree | f6a40039e4fc34a35c5775cd2b30cc8172340da1 | |
| parent | nvme-pci: quiesce IO queues prior to disabling device HMB accesses (diff) | |
| download | linux-6f8e0d787e3727ed70116e3523f4ecb86887c000.tar.xz linux-6f8e0d787e3727ed70116e3523f4ecb86887c000.zip | |
nvme: fix the dangerous reference of namespaces list
nvme_remove_namespaces and nvme_remove_invalid_namespaces reference
the ctrl->namespaces list w/o holding namespaces_mutext. It is ok
to invoke nvme_ns_remove there, but what if there is others.
To be safer, reference the ctrl->namespaces list under
namespaces_mutext.
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/nvme/host/core.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index f96b99356917..31f20f4643cf 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3098,11 +3098,18 @@ static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns *ns, *next; + LIST_HEAD(rm_list); + mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { if (ns->head->ns_id > nsid) - nvme_ns_remove(ns); + list_move_tail(&ns->list, &rm_list); } + mutex_unlock(&ctrl->namespaces_mutex); + + list_for_each_entry_safe(ns, next, &rm_list, list) + nvme_ns_remove(ns); + } static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) @@ -3202,6 +3209,7 @@ EXPORT_SYMBOL_GPL(nvme_queue_scan); void nvme_remove_namespaces(struct nvme_ctrl *ctrl) { struct nvme_ns *ns, *next; + LIST_HEAD(ns_list); /* * The dead states indicates the controller was not gracefully @@ -3212,7 +3220,11 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) if (ctrl->state == NVME_CTRL_DEAD) nvme_kill_queues(ctrl); - list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) + mutex_lock(&ctrl->namespaces_mutex); + list_splice_init(&ctrl->namespaces, &ns_list); + mutex_unlock(&ctrl->namespaces_mutex); + + list_for_each_entry_safe(ns, next, &ns_list, list) nvme_ns_remove(ns); } EXPORT_SYMBOL_GPL(nvme_remove_namespaces); |