CVE - CVE-2022-49021

CVE-ID
CVE-2022-49021	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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().
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0744c7be4de564db03e24527b2e096b7e0e20972 URL:https://git.kernel.org/stable/c/0744c7be4de564db03e24527b2e096b7e0e20972 MISC:https://git.kernel.org/stable/c/369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6 URL:https://git.kernel.org/stable/c/369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6 MISC:https://git.kernel.org/stable/c/3e21f85d87c836462bb52ef2078ea561260935c1 URL:https://git.kernel.org/stable/c/3e21f85d87c836462bb52ef2078ea561260935c1 MISC:https://git.kernel.org/stable/c/51d7f6b20fae8bae64ad1136f1e30d1fd5ba78f7 URL:https://git.kernel.org/stable/c/51d7f6b20fae8bae64ad1136f1e30d1fd5ba78f7 MISC:https://git.kernel.org/stable/c/7730904f50c7187dd16c76949efb56b5fb55cd57 URL:https://git.kernel.org/stable/c/7730904f50c7187dd16c76949efb56b5fb55cd57 MISC:https://git.kernel.org/stable/c/8aaafe0f71314f46a066382a047ba8bb3840d273 URL:https://git.kernel.org/stable/c/8aaafe0f71314f46a066382a047ba8bb3840d273 MISC:https://git.kernel.org/stable/c/eaa5722549ac2604ffa56c2e946acc83226f130c URL:https://git.kernel.org/stable/c/eaa5722549ac2604ffa56c2e946acc83226f130c MISC:https://git.kernel.org/stable/c/fe6bc99c27c21348f548966118867ed26a9a372c URL:https://git.kernel.org/stable/c/fe6bc99c27c21348f548966118867ed26a9a372c
Assigning CNA
kernel.org
Date Record Created
20240822	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240822)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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