Merge tag 'nvme-6.12-2024-10-31' of git://git.infradead.org/nvme into block-6.12

Pull NVMe fixes from Keith:

"nvme fixes for Linux 6.12

 - Spec compliant identification fix (Keith)
 - Module parameter to enable backward compatibility on unusual
   namespace formats (Keith)
 - Target double free fix when using keys (Vitaliy)
 - Passthrough command error handling fix (Keith)"

* tag 'nvme-6.12-2024-10-31' of git://git.infradead.org/nvme:
  nvme: re-fix error-handling for io_uring nvme-passthrough
  nvmet-auth: assign dh_key to NULL after kfree_sensitive
  nvme: module parameter to disable pi with offsets
  nvme: enhance cns version checking

Author: axboe

drivers/nvme/host/core.c

@@ -91,6 +91,17 @@ module_param(apst_secondary_latency_tol_us, ulong, 0644);
 MODULE_PARM_DESC(apst_secondary_latency_tol_us,
 	"secondary APST latency tolerance in us");
 
+/*
+ * Older kernels didn't enable protection information if it was at an offset.
+ * Newer kernels do, so it breaks reads on the upgrade if such formats were
+ * used in prior kernels since the metadata written did not contain a valid
+ * checksum.
+ */
+static bool disable_pi_offsets = false;
+module_param(disable_pi_offsets, bool, 0444);
+MODULE_PARM_DESC(disable_pi_offsets,
+	"disable protection information if it has an offset");
+
 /*
  * nvme_wq - hosts nvme related works that are not reset or delete
  * nvme_reset_wq - hosts nvme reset works
@@ -1390,17 +1401,30 @@ static void nvme_update_keep_alive(struct nvme_ctrl *ctrl,
 	nvme_start_keep_alive(ctrl);
 }
 
-/*
- * In NVMe 1.0 the CNS field was just a binary controller or namespace
- * flag, thus sending any new CNS opcodes has a big chance of not working.
- * Qemu unfortunately had that bug after reporting a 1.1 version compliance
- * (but not for any later version).
- */
-static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl)
+static bool nvme_id_cns_ok(struct nvme_ctrl *ctrl, u8 cns)
 {
-	if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)
-		return ctrl->vs < NVME_VS(1, 2, 0);
-	return ctrl->vs < NVME_VS(1, 1, 0);
+	/*
+	 * The CNS field occupies a full byte starting with NVMe 1.2
+	 */
+	if (ctrl->vs >= NVME_VS(1, 2, 0))
+		return true;
+
+	/*
+	 * NVMe 1.1 expanded the CNS value to two bits, which means values
+	 * larger than that could get truncated and treated as an incorrect
+	 * value.
+	 *
+	 * Qemu implemented 1.0 behavior for controllers claiming 1.1
+	 * compliance, so they need to be quirked here.
+	 */
+	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
+	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS))
+		return cns <= 3;
+
+	/*
+	 * NVMe 1.0 used a single bit for the CNS value.
+	 */
+	return cns <= 1;
 }
 
 static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
@@ -1913,8 +1937,12 @@ static void nvme_configure_metadata(struct nvme_ctrl *ctrl,
 
 	if (head->pi_size && head->ms >= head->pi_size)
 		head->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
-	if (!(id->dps & NVME_NS_DPS_PI_FIRST))
-		info->pi_offset = head->ms - head->pi_size;
+	if (!(id->dps & NVME_NS_DPS_PI_FIRST)) {
+		if (disable_pi_offsets)
+			head->pi_type = 0;
+		else
+			info->pi_offset = head->ms - head->pi_size;
+	}
 
 	if (ctrl->ops->flags & NVME_F_FABRICS) {
 		/*
@@ -3104,7 +3132,7 @@ static int nvme_init_non_mdts_limits(struct nvme_ctrl *ctrl)
 		ctrl->max_zeroes_sectors = 0;
 
 	if (ctrl->subsys->subtype != NVME_NQN_NVME ||
-	    nvme_ctrl_limited_cns(ctrl) ||
+	    !nvme_id_cns_ok(ctrl, NVME_ID_CNS_CS_CTRL) ||
 	    test_bit(NVME_CTRL_SKIP_ID_CNS_CS, &ctrl->flags))
 		return 0;
 
@@ -4200,7 +4228,7 @@ static void nvme_scan_work(struct work_struct *work)
 	}
 
 	mutex_lock(&ctrl->scan_lock);
-	if (nvme_ctrl_limited_cns(ctrl)) {
+	if (!nvme_id_cns_ok(ctrl, NVME_ID_CNS_NS_ACTIVE_LIST)) {
 		nvme_scan_ns_sequential(ctrl);
 	} else {
 		/*

drivers/nvme/host/ioctl.c

@@ -421,10 +421,13 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
 	struct io_uring_cmd *ioucmd = req->end_io_data;
 	struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 
-	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+	if (nvme_req(req)->flags & NVME_REQ_CANCELLED) {
 		pdu->status = -EINTR;
-	else
+	} else {
 		pdu->status = nvme_req(req)->status;
+		if (!pdu->status)
+			pdu->status = blk_status_to_errno(err);
+	}
 	pdu->result = le64_to_cpu(nvme_req(req)->result.u64);
 
 	/*

drivers/nvme/target/auth.c

@@ -115,6 +115,7 @@ int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, u8 dhgroup_id)
 			pr_debug("%s: ctrl %d failed to generate private key, err %d\n",
 				 __func__, ctrl->cntlid, ret);
 			kfree_sensitive(ctrl->dh_key);
+			ctrl->dh_key = NULL;
 			return ret;
 		}
 		ctrl->dh_keysize = crypto_kpp_maxsize(ctrl->dh_tfm);