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[v8,08/23] ata: libahci_platform: Sanity check the DT child nodes number

Message ID 20220909193621.17380-9-Sergey.Semin@baikalelectronics.ru
State Accepted
Commit 3c132ea6508b34956e5ed88d04936983ec230601
Headers show
Series [v8,01/23] dt-bindings: ata: ahci-platform: Move dma-coherent to sata-common.yaml | expand

Commit Message

Serge Semin Sept. 9, 2022, 7:36 p.m. UTC 
Having greater than AHCI_MAX_PORTS (32) ports detected isn't that critical
from the further AHCI-platform initialization point of view since
exceeding the ports upper limit will cause allocating more resources than
will be used afterwards. But detecting too many child DT-nodes doesn't
seem right since it's very unlikely to have it on an ordinary platform. In
accordance with the AHCI specification there can't be more than 32 ports
implemented at least due to having the CAP.NP field of 5 bits wide and the
PI register of dword size. Thus if such situation is found the DTB must
have been corrupted and the data read from it shouldn't be reliable. Let's
consider that as an erroneous situation and halt further resources
allocation.

Note it's logically more correct to have the nports set only after the
initialization value is checked for being sane. So while at it let's make
sure nports is assigned with a correct value.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Hannes Reinecke <hare@suse.de>

---

Changelog v2:
- Drop the else word from the child_nodes value checking if-else-if
  statement (@Damien) and convert the after-else part into the ternary
  operator-based statement.

Changelog v4:
- Fix some logical mistakes in the patch log. (@Sergei Shtylyov)
- Replace "?:" operator with if-else statement. (@Damien)
---
 drivers/ata/libahci_platform.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 7366eb0adf41..bacb974c1b16 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -450,14 +450,24 @@  struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 		}
 	}
 
-	hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
+	/*
+	 * Too many sub-nodes most likely means having something wrong with
+	 * the firmware.
+	 */
+	child_nodes = of_get_child_count(dev->of_node);
+	if (child_nodes > AHCI_MAX_PORTS) {
+		rc = -EINVAL;
+		goto err_out;
+	}
 
 	/*
 	 * If no sub-node was found, we still need to set nports to
 	 * one in order to be able to use the
 	 * ahci_platform_[en|dis]able_[phys|regulators] functions.
 	 */
-	if (!child_nodes)
+	if (child_nodes)
+		hpriv->nports = child_nodes;
+	else
 		hpriv->nports = 1;
 
 	hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);