Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]fbdev: simplefb: Fix use after free in simplefb_detach_genpds()[EOL][EOL]The pm_domain cleanup can not be devres managed as it uses struct[EOL]simplefb_par which is allocated within struct fb_info by[EOL]framebuffer_alloc(). This allocation is explicitly freed by[EOL]unregister_framebuffer() in simplefb_remove().[EOL]Devres managed cleanup runs after the device remove call and thus can no[EOL]longer access struct simplefb_par.[EOL]Call simplefb_detach_genpds() explicitly from simplefb_destroy() like[EOL]the cleanup functions for clocks and regulators.[EOL][EOL]Fixes an use after free on M2 Mac mini during[EOL]aperture_remove_conflicting_devices() using the downstream asahi kernel[EOL]with Debian's kernel config. For unknown reasons this started to[EOL]consistently dereference an invalid pointer in v6.16.3 based kernels.[EOL][EOL][    6.736134] BUG: KASAN: slab-use-after-free in simplefb_detach_genpds+0x58/0x220[EOL][    6.743545] Read of size 4 at addr ffff8000304743f0 by task (udev-worker)/227[EOL][    6.750697][EOL][    6.752182] CPU: 6 UID: 0 PID: 227 Comm: (udev-worker) Tainted: G S                  6.16.3-asahi+ #16 PREEMPTLAZY[EOL][    6.752186] Tainted: [S]=CPU_OUT_OF_SPEC[EOL][    6.752187] Hardware name: Apple Mac mini (M2, 2023) (DT)[EOL][    6.752189] Call trace:[EOL][    6.752190]  show_stack+0x34/0x98 (C)[EOL][    6.752194]  dump_stack_lvl+0x60/0x80[EOL][    6.752197]  print_report+0x17c/0x4d8[EOL][    6.752201]  kasan_report+0xb4/0x100[EOL][    6.752206]  __asan_report_load4_noabort+0x20/0x30[EOL][    6.752209]  simplefb_detach_genpds+0x58/0x220[EOL][    6.752213]  devm_action_release+0x50/0x98[EOL][    6.752216]  release_nodes+0xd0/0x2c8[EOL][    6.752219]  devres_release_all+0xfc/0x178[EOL][    6.752221]  device_unbind_cleanup+0x28/0x168[EOL][    6.752224]  device_release_driver_internal+0x34c/0x470[EOL][    6.752228]  device_release_driver+0x20/0x38[EOL][    6.752231]  bus_remove_device+0x1b0/0x380[EOL][    6.752234]  device_del+0x314/0x820[EOL][    6.752238]  platform_device_del+0x3c/0x1e8[EOL][    6.752242]  platform_device_unregister+0x20/0x50[EOL][    6.752246]  aperture_detach_platform_device+0x1c/0x30[EOL][    6.752250]  aperture_detach_devices+0x16c/0x290[EOL][    6.752253]  aperture_remove_conflicting_devices+0x34/0x50[EOL]...[EOL][    6.752343][EOL][    6.967409] Allocated by task 62:[EOL][    6.970724]  kasan_save_stack+0x3c/0x70[EOL][    6.974560]  kasan_save_track+0x20/0x40[EOL][    6.978397]  kasan_save_alloc_info+0x40/0x58[EOL][    6.982670]  __kasan_kmalloc+0xd4/0xd8[EOL][    6.986420]  __kmalloc_noprof+0x194/0x540[EOL][    6.990432]  framebuffer_alloc+0xc8/0x130[EOL][    6.994444]  simplefb_probe+0x258/0x2378[EOL]...[EOL][    7.054356][EOL][    7.055838] Freed by task 227:[EOL][    7.058891]  kasan_save_stack+0x3c/0x70[EOL][    7.062727]  kasan_save_track+0x20/0x40[EOL][    7.066565]  kasan_save_free_info+0x4c/0x80[EOL][    7.070751]  __kasan_slab_free+0x6c/0xa0[EOL][    7.074675]  kfree+0x10c/0x380[EOL][    7.077727]  framebuffer_release+0x5c/0x90[EOL][    7.081826]  simplefb_destroy+0x1b4/0x2c0[EOL][    7.085837]  put_fb_info+0x98/0x100[EOL][    7.089326]  unregister_framebuffer+0x178/0x320[EOL][    7.093861]  simplefb_remove+0x3c/0x60[EOL][    7.097611]  platform_remove+0x60/0x98[EOL][    7.101361]  device_remove+0xb8/0x160[EOL][    7.105024]  device_release_driver_internal+0x2fc/0x470[EOL][    7.110256]  device_release_driver+0x20/0x38[EOL][    7.114529]  bus_remove_device+0x1b0/0x380[EOL][    7.118628]  device_del+0x314/0x820[EOL][    7.122116]  platform_device_del+0x3c/0x1e8[EOL][    7.126302]  platform_device_unregister+0x20/0x50[EOL][    7.131012]  aperture_detach_platform_device+0x1c/0x30[EOL][    7.136157]  aperture_detach_devices+0x16c/0x290[EOL][    7.140779]  aperture_remove_conflicting_devices+0x34/0x50[EOL]...