CVE-2022-49021 (GCVE-0-2022-49021)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2025-05-04 08:28
VLAI?
Title
net: phy: fix null-ptr-deref while probe() failed
Summary
In the Linux kernel, the following vulnerability has been resolved: net: phy: fix null-ptr-deref while probe() failed I got a null-ptr-deref report as following when doing fault injection test: BUG: kernel NULL pointer dereference, address: 0000000000000058 Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 PID: 253 Comm: 507-spi-dm9051 Tainted: G B N 6.1.0-rc3+ Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:klist_put+0x2d/0xd0 Call Trace: <TASK> klist_remove+0xf1/0x1c0 device_release_driver_internal+0x23e/0x2d0 bus_remove_device+0x1bd/0x240 device_del+0x357/0x770 phy_device_remove+0x11/0x30 mdiobus_unregister+0xa5/0x140 release_nodes+0x6a/0xa0 devres_release_all+0xf8/0x150 device_unbind_cleanup+0x19/0xd0 //probe path: phy_device_register() device_add() phy_connect phy_attach_direct() //set device driver probe() //it's failed, driver is not bound device_bind_driver() // probe failed, it's not called //remove path: phy_device_remove() device_del() device_release_driver_internal() __device_release_driver() //dev->drv is not NULL klist_remove() <- knode_driver is not added yet, cause null-ptr-deref In phy_attach_direct(), after setting the 'dev->driver', probe() fails, device_bind_driver() is not called, so the knode_driver->n_klist is not set, then it causes null-ptr-deref in __device_release_driver() while deleting device. Fix this by setting dev->driver to NULL in the error path in phy_attach_direct().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e13934563db047043ccead26412f552375cea90c , < 8aaafe0f71314f46a066382a047ba8bb3840d273 (git)
Affected: e13934563db047043ccead26412f552375cea90c , < 51d7f6b20fae8bae64ad1136f1e30d1fd5ba78f7 (git)
Affected: e13934563db047043ccead26412f552375cea90c , < 0744c7be4de564db03e24527b2e096b7e0e20972 (git)
Affected: e13934563db047043ccead26412f552375cea90c , < 3e21f85d87c836462bb52ef2078ea561260935c1 (git)
Affected: e13934563db047043ccead26412f552375cea90c , < fe6bc99c27c21348f548966118867ed26a9a372c (git)
Affected: e13934563db047043ccead26412f552375cea90c , < 7730904f50c7187dd16c76949efb56b5fb55cd57 (git)
Affected: e13934563db047043ccead26412f552375cea90c , < eaa5722549ac2604ffa56c2e946acc83226f130c (git)
Affected: e13934563db047043ccead26412f552375cea90c , < 369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6 (git)
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    Linux Linux Affected: 2.6.14
Unaffected: 0 , < 2.6.14 (semver)
Unaffected: 4.9.335 , ≤ 4.9.* (semver)
Unaffected: 4.14.301 , ≤ 4.14.* (semver)
Unaffected: 4.19.268 , ≤ 4.19.* (semver)
Unaffected: 5.4.226 , ≤ 5.4.* (semver)
Unaffected: 5.10.158 , ≤ 5.10.* (semver)
Unaffected: 5.15.82 , ≤ 5.15.* (semver)
Unaffected: 6.0.12 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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\u003cTASK\u003e\\n klist_remove+0xf1/0x1c0\\n device_release_driver_internal+0x23e/0x2d0\\n bus_remove_device+0x1bd/0x240\\n device_del+0x357/0x770\\n phy_device_remove+0x11/0x30\\n mdiobus_unregister+0xa5/0x140\\n release_nodes+0x6a/0xa0\\n devres_release_all+0xf8/0x150\\n device_unbind_cleanup+0x19/0xd0\\n\\n//probe path:\\nphy_device_register()\\n  device_add()\\n\\nphy_connect\\n  phy_attach_direct() //set device driver\\n    probe() //it\u0027s failed, driver is not bound\\n    device_bind_driver() // probe failed, it\u0027s not called\\n\\n//remove path:\\nphy_device_remove()\\n  device_del()\\n    device_release_driver_internal()\\n      __device_release_driver() //dev-\u003edrv is not NULL\\n        klist_remove() \u003c- knode_driver is not added yet, cause null-ptr-deref\\n\\nIn phy_attach_direct(), after setting the \u0027dev-\u003edriver\u0027, probe() fails,\\ndevice_bind_driver() is not called, so the knode_driver-\u003en_klist is not\\nset, then it causes null-ptr-deref in __device_release_driver() while\\ndeleting device. Fix this by setting dev-\u003edriver to NULL in the error\\npath in phy_attach_direct().\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:12:35.902Z\"}}}",
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