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From 0fa424a08a31af512a698b60b497cfc0cf0554e0 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 25 Jan 2016 17:16:27 +0100
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Subject: [PATCH] udev: filter out non-sensically high onboard indexes reported
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by the kernel
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Let's not accept onboard interface indexes, that are so high that they are obviously non-sensical.
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Fixes: #2407
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Cherry-picked from: 6c1e69f9456d022f14dd00737126cfa4d9cca10
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Resolves: #1230210
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---
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src/udev/udev-builtin-net_id.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
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index ffd6ea4..19e1f26 100644
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--- a/src/udev/udev-builtin-net_id.c
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+++ b/src/udev/udev-builtin-net_id.c
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@@ -101,6 +101,8 @@
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#include "udev.h"
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#include "fileio.h"
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+#define ONBOARD_INDEX_MAX (16*1024-1)
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+
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enum netname_type{
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NET_UNDEF,
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NET_PCI,
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@@ -147,6 +149,13 @@ static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) {
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if (idx <= 0)
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return -EINVAL;
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+ /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to report for
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+ * example). Let's define a cut-off where we don't consider the index reliable anymore. We pick some arbitrary
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+ * cut-off, which is somewhere beyond the realistic number of physical network interface a system might
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+ * have. Ideally the kernel would already filter his crap for us, but it doesn't currently. */
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+ if (idx > ONBOARD_INDEX_MAX)
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+ return -ENOENT;
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+
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/* kernel provided port index for multiple ports on a single PCI function */
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attr = udev_device_get_sysattr_value(dev, "dev_port");
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if (attr)
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