CVE-2021-47333 (GCVE-0-2021-47333)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:08
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: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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[{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"d2639ffdcad4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"58f69684ba03\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"717cf5ae5232\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"09d154990ca8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f4\", \"lessThan\": \"3ce3e45cc333\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/misc/cardreader/alcor_pci.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"5.4.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.52\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/misc/cardreader/alcor_pci.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb\"}, {\"url\": \"https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309\"}, {\"url\": \"https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174\"}, {\"url\": \"https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d\"}, {\"url\": \"https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\\n\\nThere is an issue with the ASPM(optional) capability checking function.\\nA device might be attached to root complex directly, in this case,\\nbus-\u003eself(bridge) will be NULL, thus priv-\u003eparent_pdev is NULL.\\nSince alcor_pci_init_check_aspm(priv-\u003eparent_pdev) checks the PCI link\u0027s\\nASPM capability and populate parent_cap_off, which will be used later by\\nalcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do\\nhere is to avoid checking the capability if we are on the root complex.\\nThis will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply\\nreturn when bring called, effectively disable ASPM for the device.\\n\\n[    1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\\n[    1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\\n[    1.253998] Call Trace:\\n[    1.254131]  ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\\n[    1.254476]  alcor_pci_probe+0x169/0x2d5 [alcor_pci]\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:03:52.163Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47333\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:03:52.163Z\", \"dateReserved\": \"2024-05-21T14:28:16.975Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:43.760Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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