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udev: filter out non-sensically high onboard indexes reported by the kernel

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Let's not accept onboard interface indexes, that are so high that they are obviously non-sensical.

Fixes: #2407
This commit is contained in:
Lennart Poettering 2016-01-25 17:16:27 +01:00
parent 4cb94977ed
commit 6c1e69f945
1 changed files with 9 additions and 0 deletions
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9
src/udev/udev-builtin-net_id.c
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@ -106,6 +106,8 @@
#include "string-util.h"
#include "udev.h"
#define ONBOARD_INDEX_MAX (16*1024-1)
enum netname_type{
NET_UNDEF,
NET_PCI,
@ -152,6 +154,13 @@ static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
if (idx <= 0)
return -EINVAL;
/* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
* example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
* cut-off, which is somewhere beyond the realistic number of physical network interface a system might
* have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
if (idx > ONBOARD_INDEX_MAX)
return -ENOENT;
/* kernel provided port index for multiple ports on a single PCI function */
attr = udev_device_get_sysattr_value(dev, "dev_port");
if (attr)