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authorJean Delvare <khali@linux-fr.org>2008-08-17 21:06:59 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-10-20 10:48:35 -0700
commitb41d6cf38e27a940d998d989526a9748de1bf028 (patch)
treea2ae90005e000d4f9d16637171ff11dd31a4917a
parentedbc25caaa492a82e19baa915f1f6b0a0db6554d (diff)
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PCI: Check dynids driver_data value for validity
Only accept dynids whose driver_data value matches one of the driver's pci_driver_id entries. This prevents the user from accidentally passing values the drivers do not expect. Cc: Milton Miller <miltonm@bga.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--Documentation/PCI/pci.txt4
-rw-r--r--drivers/i2c/busses/i2c-amd756.c4
-rw-r--r--drivers/i2c/busses/i2c-viapro.c4
-rw-r--r--drivers/pci/pci-driver.c18
4 files changed, 20 insertions, 10 deletions
diff --git a/Documentation/PCI/pci.txt b/Documentation/PCI/pci.txt
index 8d4dc6250c5..fd4907a2968 100644
--- a/Documentation/PCI/pci.txt
+++ b/Documentation/PCI/pci.txt
@@ -163,6 +163,10 @@ need pass only as many optional fields as necessary:
o class and classmask fields default to 0
o driver_data defaults to 0UL.
+Note that driver_data must match the value used by any of the pci_device_id
+entries defined in the driver. This makes the driver_data field mandatory
+if all the pci_device_id entries have a non-zero driver_data value.
+
Once added, the driver probe routine will be invoked for any unclaimed
PCI devices listed in its (newly updated) pci_ids list.
diff --git a/drivers/i2c/busses/i2c-amd756.c b/drivers/i2c/busses/i2c-amd756.c
index a3542b053c8..424dad6f18d 100644
--- a/drivers/i2c/busses/i2c-amd756.c
+++ b/drivers/i2c/busses/i2c-amd756.c
@@ -332,10 +332,6 @@ 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");
diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c
index 2324780484c..9f194d9efd9 100644
--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -332,10 +332,6 @@ 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;
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 4940a53c56a..b4cdd690ae7 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -43,18 +43,32 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
{
struct pci_dynid *dynid;
struct pci_driver *pdrv = to_pci_driver(driver);
+ const struct pci_device_id *ids = pdrv->id_table;
__u32 vendor, device, subvendor=PCI_ANY_ID,
subdevice=PCI_ANY_ID, class=0, class_mask=0;
unsigned long driver_data=0;
int fields=0;
- int retval = 0;
+ int retval;
- fields = sscanf(buf, "%x %x %x %x %x %x %lux",
+ fields = sscanf(buf, "%x %x %x %x %x %x %lx",
&vendor, &device, &subvendor, &subdevice,
&class, &class_mask, &driver_data);
if (fields < 2)
return -EINVAL;
+ /* Only accept driver_data values that match an existing id_table
+ entry */
+ retval = -EINVAL;
+ while (ids->vendor || ids->subvendor || ids->class_mask) {
+ if (driver_data == ids->driver_data) {
+ retval = 0;
+ break;
+ }
+ ids++;
+ }
+ if (retval) /* No match */
+ return retval;
+
dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
if (!dynid)
return -ENOMEM;