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authorJean Delvare <khali@linux-fr.org>2008-01-27 18:14:51 +0100
committerJean Delvare <khali@hyperion.delvare>2008-01-27 18:14:51 +0100
commit0f07a24b4baf14859fde39b29bcc6fe279d18109 (patch)
tree0ff3b88a1435a37480e9203dcca91482fb1dba3c /drivers/i2c
parentb7a3670131c7662415fa799700fc0bdfe90a54b6 (diff)
i2c: Let the user specify PCI driver data through new_id
The i2c-amd756 and i2c-viapro drivers make use of the driver_data field of the PCI device ID. When adding device IDs dynamically (by writing to the new_id sysfs file) you cannot set the value of this field by default. It has to be allowed explicitly. Do that, and check the value so that the user can't crash the kernel accidentally. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-amd756.c5
-rw-r--r--drivers/i2c/busses/i2c-viapro.c5
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-amd756.c b/drivers/i2c/busses/i2c-amd756.c
index 7490dc1771a..573abe44084 100644
--- a/drivers/i2c/busses/i2c-amd756.c
+++ b/drivers/i2c/busses/i2c-amd756.c
@@ -334,6 +334,10 @@ static int __devinit amd756_probe(struct pci_dev *pdev,
int error;
u8 temp;
+ /* driver_data might come from user-space, so check it */
+ if (id->driver_data > ARRAY_SIZE(chipname))
+ return -EINVAL;
+
if (amd756_ioport) {
dev_err(&pdev->dev, "Only one device supported "
"(you have a strange motherboard, btw)\n");
@@ -405,6 +409,7 @@ static struct pci_driver amd756_driver = {
.id_table = amd756_ids,
.probe = amd756_probe,
.remove = __devexit_p(amd756_remove),
+ .dynids.use_driver_data = 1,
};
static int __init amd756_init(void)
diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c
index c9ce77f13c0..661ebc7a711 100644
--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -318,6 +318,10 @@ static int __devinit vt596_probe(struct pci_dev *pdev,
unsigned char temp;
int error = -ENODEV;
+ /* driver_data might come from user-space, so check it */
+ if (id->driver_data & 1 || id->driver_data > 0xff)
+ return -EINVAL;
+
/* Determine the address of the SMBus areas */
if (force_addr) {
vt596_smba = force_addr & 0xfff0;
@@ -455,6 +459,7 @@ static struct pci_driver vt596_driver = {
.name = "vt596_smbus",
.id_table = vt596_ids,
.probe = vt596_probe,
+ .dynids.use_driver_data = 1,
};
static int __init i2c_vt596_init(void)