CVE-2021-47333 (GCVE-0-2021-47333)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2026-05-11 13:52
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge There is an issue with the ASPM(optional) capability checking function. A device might be attached to root complex directly, in this case, bus->self(bridge) will be NULL, thus priv->parent_pdev is NULL. Since alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's ASPM capability and populate parent_cap_off, which will be used later by alcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do here is to avoid checking the capability if we are on the root complex. This will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply return when bring called, effectively disable ASPM for the device. [ 1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0 [ 1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [ 1.253998] Call Trace: [ 1.254131] ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]
References
Impacted products
Vendor Product Version
Linux Linux Version: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d
Version: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d
Version: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d
Version: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d
Version: 4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d
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