CVE-2022-49960

In the Linux kernel, the following vulnerability has been resolved:

drm/i915: fix null pointer dereference

Asus chromebook CX550 crashes during boot on v5.17-rc1 kernel. The root cause is null pointer defeference of bi_next in tgl_get_bw_info() in drivers/gpu/drm/i915/display/intel_bw.c.

BUG: kernel NULL pointer dereference, address: 000000000000002e PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 1 Comm: swapper/0 Tainted: G U 5.17.0-rc1 Hardware name: Google Delbin/Delbin, BIOS Google_Delbin.13672.156.3 05/14/2021 RIP: 0010:tgl_get_bw_info+0x2de/0x510 ... [ 2.554467] Call Trace: [ 2.554467] <TASK> [ 2.554467] intel_bw_init_hw+0x14a/0x434 [ 2.554467] ? _printk+0x59/0x73 [ 2.554467] ? _dev_err+0x77/0x91 [ 2.554467] i915_driver_hw_probe+0x329/0x33e [ 2.554467] i915_driver_probe+0x4c8/0x638 [ 2.554467] i915_pci_probe+0xf8/0x14e [ 2.554467] ? _raw_spin_unlock_irqrestore+0x12/0x2c [ 2.554467] pci_device_probe+0xaa/0x142 [ 2.554467] really_probe+0x13f/0x2f4 [ 2.554467] __driver_probe_device+0x9e/0xd3 [ 2.554467] driver_probe_device+0x24/0x7c [ 2.554467] __driver_attach+0xba/0xcf [ 2.554467] ? driver_attach+0x1f/0x1f [ 2.554467] bus_for_each_dev+0x8c/0xc0 [ 2.554467] bus_add_driver+0x11b/0x1f7 [ 2.554467] driver_register+0x60/0xea [ 2.554467] ? mipi_dsi_bus_init+0x16/0x16 [ 2.554467] i915_init+0x2c/0xb9 [ 2.554467] ? mipi_dsi_bus_init+0x16/0x16 [ 2.554467] do_one_initcall+0x12e/0x2b3 [ 2.554467] do_initcall_level+0xd6/0xf3 [ 2.554467] do_initcalls+0x4e/0x79 [ 2.554467] kernel_init_freeable+0xed/0x14d [ 2.554467] ? rest_init+0xc1/0xc1 [ 2.554467] kernel_init+0x1a/0x120 [ 2.554467] ret_from_fork+0x1f/0x30 [ 2.554467] </TASK> ... Kernel panic - not syncing: Fatal exception

(cherry picked from commit c247cd03898c4c43c3bce6d4014730403bc13032)

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.