ata: libahci_platform: Sanity check the DT child nodes number

[ Upstream commit 01e9290e96ce05ed845dfc7bacceb4fd1b2d6b02 ]

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>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 8a963d2a951dbb9cd26d78fe6113a793b98fef1d..c0ac25b80a1fcc7b4a2c0bcd9f29694821674bc2 100644 (file)
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -451,14 +451,24 @@ 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);