ASoC: SOF: Intel: Check the bar size before remapping

The driver should use the pci_resource_len() to get the actual length of
pci bar, and compare it with the expect value. If the bar size is too
small (such as a broken device), the driver should return an error.

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Link: https://lore.kernel.org/r/20220409143950.2570186-1-zheyuma97@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/pci-tng.c b/sound/soc/sof/intel/pci-tng.c
index 6efef22..7d502cc 100644 (file)
--- a/sound/soc/sof/intel/pci-tng.c
+++ b/sound/soc/sof/intel/pci-tng.c
@@ -75,7 +75,11 @@ static int tangier_pci_probe(struct snd_sof_dev *sdev)
 
        /* LPE base */
        base = pci_resource_start(pci, desc->resindex_lpe_base) - IRAM_OFFSET;
-       size = PCI_BAR_SIZE;
+       size = pci_resource_len(pci, desc->resindex_lpe_base);
+       if (size < PCI_BAR_SIZE) {
+               dev_err(sdev->dev, "error: I/O region is too small.\n");
+               return -ENODEV;
+       }
 
        dev_dbg(sdev->dev, "LPE PHY base at 0x%x size 0x%x", base, size);
        sdev->bar[DSP_BAR] = devm_ioremap(sdev->dev, base, size);