linux-kernel - [PATCH 3/7] habanalabs: enforce alignment upon registers access through debugfs

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Date:   Fri,  1 Apr 2022 15:20:13 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Dafna Hirschfeld <dhirschfeld@...ana.ai>
Subject: [PATCH 3/7] habanalabs: enforce alignment upon registers access through debugfs

From: Dafna Hirschfeld <dhirschfeld@...ana.ai>

When accessing the configuration registers through debugfs,
it is only allowed to access aligned address.
Fail if address is not aligned.

Signed-off-by: Dafna Hirschfeld <dhirschfeld@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index bd76a68d44be..9a71737fc804 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -94,6 +94,11 @@ int hl_access_cfg_region(struct hl_device *hdev, u64 addr, u64 *val,
 	struct pci_mem_region *cfg_region = &hdev->pci_mem_region[PCI_REGION_CFG];
 	u32 val_h, val_l;
 
+	if (!IS_ALIGNED(addr, sizeof(u32))) {
+		dev_err(hdev->dev, "address %#llx not a multiple of %zu\n", addr, sizeof(u32));
+		return -EINVAL;
+	}
+
 	switch (acc_type) {
 	case DEBUGFS_READ32:
 		*val = RREG32(addr - cfg_region->region_base);
-- 
2.25.1