From: Hans Verkuil <hans.verk...@cisco.com>
Prevent out-of-range register accesses.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Cc: Jonathan Corbet <cor...@lwn.net>
---
drivers/media/platform/marvell-ccic/cafe-driver.c | 1 +
drivers/media/platform/marvell-ccic/mcam-core.c | 4 ++++
drivers/media/platform/marvell-ccic/mcam-core.h | 1 +
drivers/media/platform/marvell-ccic/mmp-driver.c | 1 +
4 files changed, 7 insertions(+)
diff --git a/drivers/media/platform/marvell-ccic/cafe-driver.c
b/drivers/media/platform/marvell-ccic/cafe-driver.c
index 7b07fc5..1f079ff 100644
--- a/drivers/media/platform/marvell-ccic/cafe-driver.c
+++ b/drivers/media/platform/marvell-ccic/cafe-driver.c
@@ -500,6 +500,7 @@ static int cafe_pci_probe(struct pci_dev *pdev,
printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
goto out_disable;
}
+ mcam->regs_size = pci_resource_len(pdev, 0);
ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
if (ret)
goto out_iounmap;
diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c
b/drivers/media/platform/marvell-ccic/mcam-core.c
index a187161..c69cfc4 100644
--- a/drivers/media/platform/marvell-ccic/mcam-core.c
+++ b/drivers/media/platform/marvell-ccic/mcam-core.c
@@ -1404,6 +1404,8 @@ static int mcam_vidioc_g_register(struct file *file, void
*priv,
{
struct mcam_camera *cam = priv;
+ if (reg->reg > cam->regs_size - 4)
+ return -EINVAL;
reg->val = mcam_reg_read(cam, reg->reg);
reg->size = 4;
return 0;
@@ -1414,6 +1416,8 @@ static int mcam_vidioc_s_register(struct file *file, void
*priv,
{
struct mcam_camera *cam = priv;
+ if (reg->reg > cam->regs_size - 4)
+ return -EINVAL;
mcam_reg_write(cam, reg->reg, reg->val);
return 0;
}
diff --git a/drivers/media/platform/marvell-ccic/mcam-core.h
b/drivers/media/platform/marvell-ccic/mcam-core.h
index 46b6ea3..520c8de 100644
--- a/drivers/media/platform/marvell-ccic/mcam-core.h
+++ b/drivers/media/platform/marvell-ccic/mcam-core.h
@@ -101,6 +101,7 @@ struct mcam_camera {
*/
struct i2c_adapter *i2c_adapter;
unsigned char __iomem *regs;
+ unsigned regs_size; /* size in bytes of the register space */
spinlock_t dev_lock;
struct device *dev; /* For messages, dma alloc */
enum mcam_chip_id chip_id;
diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c
b/drivers/media/platform/marvell-ccic/mmp-driver.c
index cadad64..a634888 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -202,6 +202,7 @@ static int mmpcam_probe(struct platform_device *pdev)
ret = -ENODEV;
goto out_free;
}
+ mcam->regs_size = resource_size(res);
/*
* Power/clock memory is elsewhere; get it too. Perhaps this
* should really be managed outside of this driver?
--
1.7.10.4
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