[PATCH AUTOSEL 6.6 16/40] nvme: catch errors from nvme_configure_metadata()

Sasha Levin
2023-11-28T21:07:34Z

From: Hannes Reinecke <hare@suse.de>

[ Upstream commit cd9aed606088d36a7ffff3e808db4e76b1854285 ]

nvme_configure_metadata() is issuing I/O, so we might incur an I/O
error which will cause the connection to be reset.
But in that case any further probing will race with reset and
cause UAF errors.
So return a status from nvme_configure_metadata() and abort
probing if there was an I/O error.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/core.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 21783aa2ee8e1..5e314a8fb9407 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1813,16 +1813,18 @@ static int nvme_init_ms(struct nvme_ns *ns, struct nvme_id_ns *id)
return ret;
}

-static void nvme_configure_metadata(struct nvme_ns *ns, struct nvme_id_ns *id)
+static int nvme_configure_metadata(struct nvme_ns *ns, struct nvme_id_ns *id)
{
struct nvme_ctrl *ctrl = ns->ctrl;
+ int ret;

- if (nvme_init_ms(ns, id))
- return;
+ ret = nvme_init_ms(ns, id);
+ if (ret)
+ return ret;

ns->features &= ~(NVME_NS_METADATA_SUPPORTED | NVME_NS_EXT_LBAS);
if (!ns->ms || !(ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
- return;
+ return 0;

if (ctrl->ops->flags & NVME_F_FABRICS) {
/*
@@ -1831,7 +1833,7 @@ static void nvme_configure_metadata(struct nvme_ns *ns, struct nvme_id_ns *id)
* remap the separate metadata buffer from the block layer.
*/
if (WARN_ON_ONCE(!(id->flbas & NVME_NS_FLBAS_META_EXT)))
- return;
+ return 0;

ns->features |= NVME_NS_EXT_LBAS;

@@ -1858,6 +1860,7 @@ static void nvme_configure_metadata(struct nvme_ns *ns, struct nvme_id_ns *id)
else
ns->features |= NVME_NS_METADATA_SUPPORTED;
}
+ return 0;
}

static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
@@ -2031,7 +2034,11 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
ns->lba_shift = id->lbaf[lbaf].ds;
nvme_set_queue_limits(ns->ctrl, ns->queue);

- nvme_configure_metadata(ns, id);
+ ret = nvme_configure_metadata(ns, id);
+ if (ret < 0) {
+ blk_mq_unfreeze_queue(ns->disk->queue);
+ goto out;
+ }
nvme_set_chunk_sectors(ns, id);
nvme_update_disk_info(ns->disk, ns, id);

--
2.42.0