Ubuntu: (CVE-2022-49021): linux vulnerability
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().
Solution(s)
- ubuntu-upgrade-linux
- ubuntu-upgrade-linux-aws
- ubuntu-upgrade-linux-aws-5-15
- ubuntu-upgrade-linux-aws-5-4
- ubuntu-upgrade-linux-aws-hwe
- ubuntu-upgrade-linux-azure
- ubuntu-upgrade-linux-azure-4-15
- ubuntu-upgrade-linux-azure-5-15
- ubuntu-upgrade-linux-azure-5-4
- ubuntu-upgrade-linux-azure-fde
- ubuntu-upgrade-linux-azure-fde-5-15
- ubuntu-upgrade-linux-bluefield
- ubuntu-upgrade-linux-gcp
- ubuntu-upgrade-linux-gcp-4-15
- ubuntu-upgrade-linux-gcp-5-15
- ubuntu-upgrade-linux-gcp-5-4
- ubuntu-upgrade-linux-gke
- ubuntu-upgrade-linux-gkeop
- ubuntu-upgrade-linux-gkeop-5-15
- ubuntu-upgrade-linux-hwe
- ubuntu-upgrade-linux-hwe-5-15
- ubuntu-upgrade-linux-hwe-5-4
- ubuntu-upgrade-linux-ibm
- ubuntu-upgrade-linux-ibm-5-4
- ubuntu-upgrade-linux-intel-iotg
- ubuntu-upgrade-linux-intel-iotg-5-15
- ubuntu-upgrade-linux-iot
- ubuntu-upgrade-linux-kvm
- ubuntu-upgrade-linux-lowlatency
- ubuntu-upgrade-linux-lowlatency-hwe-5-15
- ubuntu-upgrade-linux-nvidia
- ubuntu-upgrade-linux-oracle
- ubuntu-upgrade-linux-oracle-5-15
- ubuntu-upgrade-linux-oracle-5-4
- ubuntu-upgrade-linux-raspi
- ubuntu-upgrade-linux-raspi-5-4
- ubuntu-upgrade-linux-riscv-5-15
- ubuntu-upgrade-linux-xilinx-zynqmp
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