linux-kernel - [PATCH] ASoC: SOF: Intel: Check the bar size before remapping

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Message-Id: <20220409143950.2570186-1-zheyuma97@gmail.com>
Date:   Sat,  9 Apr 2022 22:39:50 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     pierre-louis.bossart@...ux.intel.com, lgirdwood@...il.com,
        ranjani.sridharan@...ux.intel.com, kai.vehmanen@...ux.intel.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        peter.ujfalusi@...ux.intel.com
Cc:     sound-open-firmware@...a-project.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Zheyu Ma <zheyuma97@...il.com>
Subject: [PATCH] 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@...il.com>
---
 sound/soc/sof/intel/pci-tng.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/intel/pci-tng.c b/sound/soc/sof/intel/pci-tng.c
index 6efef225973f..7d502cc3ca80 100644
--- 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);
-- 
2.25.1