cve-2023-52856
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2024-12-19 08:27
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/bridge: lt8912b: Fix crash on bridge detach The lt8912b driver, in its bridge detach function, calls drm_connector_unregister() and drm_connector_cleanup(). drm_connector_unregister() should be called only for connectors explicitly registered with drm_connector_register(), which is not the case in lt8912b. The driver's drm_connector_funcs.destroy hook is set to drm_connector_cleanup(). Thus the driver should not call either drm_connector_unregister() nor drm_connector_cleanup() in its lt8912_bridge_detach(), as they cause a crash on bridge detach: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000000858f3000 [0000000000000000] pgd=0800000085918003, p4d=0800000085918003, pud=0800000085431003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: tidss(-) display_connector lontium_lt8912b tc358768 panel_lvds panel_simple drm_dma_helper drm_kms_helper drm drm_panel_orientation_quirks CPU: 3 PID: 462 Comm: rmmod Tainted: G W 6.5.0-rc2+ #2 Hardware name: Toradex Verdin AM62 on Verdin Development Board (DT) pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : drm_connector_cleanup+0x78/0x2d4 [drm] lr : lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b] sp : ffff800082ed3a90 x29: ffff800082ed3a90 x28: ffff0000040c1940 x27: 0000000000000000 x26: 0000000000000000 x25: dead000000000122 x24: dead000000000122 x23: dead000000000100 x22: ffff000003fb6388 x21: 0000000000000000 x20: 0000000000000000 x19: ffff000003fb6260 x18: fffffffffffe56e8 x17: 0000000000000000 x16: 0010000000000000 x15: 0000000000000038 x14: 0000000000000000 x13: ffff800081914b48 x12: 000000000000040e x11: 000000000000015a x10: ffff80008196ebb8 x9 : ffff800081914b48 x8 : 00000000ffffefff x7 : ffff0000040c1940 x6 : ffff80007aa649d0 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008159e008 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: drm_connector_cleanup+0x78/0x2d4 [drm] lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b] drm_bridge_detach+0x44/0x84 [drm] drm_encoder_cleanup+0x40/0xb8 [drm] drmm_encoder_alloc_release+0x1c/0x30 [drm] drm_managed_release+0xac/0x148 [drm] drm_dev_put.part.0+0x88/0xb8 [drm] devm_drm_dev_init_release+0x14/0x24 [drm] devm_action_release+0x14/0x20 release_nodes+0x5c/0x90 devres_release_all+0x8c/0xe0 device_unbind_cleanup+0x18/0x68 device_release_driver_internal+0x208/0x23c driver_detach+0x4c/0x94 bus_remove_driver+0x70/0xf4 driver_unregister+0x30/0x60 platform_driver_unregister+0x14/0x20 tidss_platform_driver_exit+0x18/0xb2c [tidss] __arm64_sys_delete_module+0x1a0/0x2b4 invoke_syscall+0x48/0x110 el0_svc_common.constprop.0+0x60/0x10c do_el0_svc_compat+0x1c/0x40 el0_svc_compat+0x40/0xac el0t_32_sync_handler+0xb0/0x138 el0t_32_sync+0x194/0x198 Code: 9104a276 f2fbd5b7 aa0203e1 91008af8 (f85c0420)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42071feab712ba2a139b8928f7e0f8d3a6fc719e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44283993144a03af9df31934d6c32bbd42d1a347
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7bf0cb8f40280a85034990dfe42be8ca8f80f37a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b65e3249f3ca96e3c736af889461d80d675feab6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcd9895e365474709844eeb31cfe53d912c3596e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/42071feab712ba2a139b8928f7e0f8d3a6fc719e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/44283993144a03af9df31934d6c32bbd42d1a347
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7bf0cb8f40280a85034990dfe42be8ca8f80f37a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b65e3249f3ca96e3c736af889461d80d675feab6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fcd9895e365474709844eeb31cfe53d912c3596e
Impacted products
Vendor Product Version
Linux Linux Version: 5.13
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/bridge: lt8912b: Fix crash on bridge detach\n\nThe lt8912b driver, in its bridge detach function, calls\ndrm_connector_unregister() and drm_connector_cleanup().\n\ndrm_connector_unregister() should be called only for connectors\nexplicitly registered with drm_connector_register(), which is not the\ncase in lt8912b.\n\nThe driver\u0027s drm_connector_funcs.destroy hook is set to\ndrm_connector_cleanup().\n\nThus the driver should not call either drm_connector_unregister() nor\ndrm_connector_cleanup() in its lt8912_bridge_detach(), as they cause a\ncrash on bridge detach:\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000000\nMem abort info:\n  ESR = 0x0000000096000006\n  EC = 0x25: DABT (current EL), IL = 32 bits\n  SET = 0, FnV = 0\n  EA = 0, S1PTW = 0\n  FSC = 0x06: level 2 translation fault\nData abort info:\n  ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n  CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\nuser pgtable: 4k pages, 48-bit VAs, pgdp=00000000858f3000\n[0000000000000000] pgd=0800000085918003, p4d=0800000085918003, pud=0800000085431003, pmd=0000000000000000\nInternal error: Oops: 0000000096000006 [#1] PREEMPT SMP\nModules linked in: tidss(-) display_connector lontium_lt8912b tc358768 panel_lvds panel_simple drm_dma_helper drm_kms_helper drm drm_panel_orientation_quirks\nCPU: 3 PID: 462 Comm: rmmod Tainted: G        W          6.5.0-rc2+ #2\nHardware name: Toradex Verdin AM62 on Verdin Development Board (DT)\npstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : drm_connector_cleanup+0x78/0x2d4 [drm]\nlr : lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b]\nsp : ffff800082ed3a90\nx29: ffff800082ed3a90 x28: ffff0000040c1940 x27: 0000000000000000\nx26: 0000000000000000 x25: dead000000000122 x24: dead000000000122\nx23: dead000000000100 x22: ffff000003fb6388 x21: 0000000000000000\nx20: 0000000000000000 x19: ffff000003fb6260 x18: fffffffffffe56e8\nx17: 0000000000000000 x16: 0010000000000000 x15: 0000000000000038\nx14: 0000000000000000 x13: ffff800081914b48 x12: 000000000000040e\nx11: 000000000000015a x10: ffff80008196ebb8 x9 : ffff800081914b48\nx8 : 00000000ffffefff x7 : ffff0000040c1940 x6 : ffff80007aa649d0\nx5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008159e008\nx2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000\nCall trace:\n drm_connector_cleanup+0x78/0x2d4 [drm]\n lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b]\n drm_bridge_detach+0x44/0x84 [drm]\n drm_encoder_cleanup+0x40/0xb8 [drm]\n drmm_encoder_alloc_release+0x1c/0x30 [drm]\n drm_managed_release+0xac/0x148 [drm]\n drm_dev_put.part.0+0x88/0xb8 [drm]\n devm_drm_dev_init_release+0x14/0x24 [drm]\n devm_action_release+0x14/0x20\n release_nodes+0x5c/0x90\n devres_release_all+0x8c/0xe0\n device_unbind_cleanup+0x18/0x68\n device_release_driver_internal+0x208/0x23c\n driver_detach+0x4c/0x94\n bus_remove_driver+0x70/0xf4\n driver_unregister+0x30/0x60\n platform_driver_unregister+0x14/0x20\n tidss_platform_driver_exit+0x18/0xb2c [tidss]\n __arm64_sys_delete_module+0x1a0/0x2b4\n invoke_syscall+0x48/0x110\n el0_svc_common.constprop.0+0x60/0x10c\n do_el0_svc_compat+0x1c/0x40\n el0_svc_compat+0x40/0xac\n el0t_32_sync_handler+0xb0/0x138\n el0t_32_sync+0x194/0x198\nCode: 9104a276 f2fbd5b7 aa0203e1 91008af8 (f85c0420)"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52856",
    "datePublished": "2024-05-21T15:31:50.569Z",
    "dateReserved": "2024-05-21T15:19:24.257Z",
    "dateUpdated": "2024-12-19T08:27:17.970Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52856\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:22.727\",\"lastModified\":\"2024-11-21T08:40:43.957\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/bridge: lt8912b: Fix crash on bridge detach\\n\\nThe lt8912b driver, in its bridge detach function, calls\\ndrm_connector_unregister() and drm_connector_cleanup().\\n\\ndrm_connector_unregister() should be called only for connectors\\nexplicitly registered with drm_connector_register(), which is not the\\ncase in lt8912b.\\n\\nThe driver\u0027s drm_connector_funcs.destroy hook is set to\\ndrm_connector_cleanup().\\n\\nThus the driver should not call either drm_connector_unregister() nor\\ndrm_connector_cleanup() in its lt8912_bridge_detach(), as they cause a\\ncrash on bridge detach:\\n\\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000000\\nMem abort info:\\n  ESR = 0x0000000096000006\\n  EC = 0x25: DABT (current EL), IL = 32 bits\\n  SET = 0, FnV = 0\\n  EA = 0, S1PTW = 0\\n  FSC = 0x06: level 2 translation fault\\nData abort info:\\n  ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\\n  CM = 0, WnR = 0, TnD = 0, TagAccess = 0\\n  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\\nuser pgtable: 4k pages, 48-bit VAs, pgdp=00000000858f3000\\n[0000000000000000] pgd=0800000085918003, p4d=0800000085918003, pud=0800000085431003, pmd=0000000000000000\\nInternal error: Oops: 0000000096000006 [#1] PREEMPT SMP\\nModules linked in: tidss(-) display_connector lontium_lt8912b tc358768 panel_lvds panel_simple drm_dma_helper drm_kms_helper drm drm_panel_orientation_quirks\\nCPU: 3 PID: 462 Comm: rmmod Tainted: G        W          6.5.0-rc2+ #2\\nHardware name: Toradex Verdin AM62 on Verdin Development Board (DT)\\npstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\npc : drm_connector_cleanup+0x78/0x2d4 [drm]\\nlr : lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b]\\nsp : ffff800082ed3a90\\nx29: ffff800082ed3a90 x28: ffff0000040c1940 x27: 0000000000000000\\nx26: 0000000000000000 x25: dead000000000122 x24: dead000000000122\\nx23: dead000000000100 x22: ffff000003fb6388 x21: 0000000000000000\\nx20: 0000000000000000 x19: ffff000003fb6260 x18: fffffffffffe56e8\\nx17: 0000000000000000 x16: 0010000000000000 x15: 0000000000000038\\nx14: 0000000000000000 x13: ffff800081914b48 x12: 000000000000040e\\nx11: 000000000000015a x10: ffff80008196ebb8 x9 : ffff800081914b48\\nx8 : 00000000ffffefff x7 : ffff0000040c1940 x6 : ffff80007aa649d0\\nx5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008159e008\\nx2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000\\nCall trace:\\n drm_connector_cleanup+0x78/0x2d4 [drm]\\n lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b]\\n drm_bridge_detach+0x44/0x84 [drm]\\n drm_encoder_cleanup+0x40/0xb8 [drm]\\n drmm_encoder_alloc_release+0x1c/0x30 [drm]\\n drm_managed_release+0xac/0x148 [drm]\\n drm_dev_put.part.0+0x88/0xb8 [drm]\\n devm_drm_dev_init_release+0x14/0x24 [drm]\\n devm_action_release+0x14/0x20\\n release_nodes+0x5c/0x90\\n devres_release_all+0x8c/0xe0\\n device_unbind_cleanup+0x18/0x68\\n device_release_driver_internal+0x208/0x23c\\n driver_detach+0x4c/0x94\\n bus_remove_driver+0x70/0xf4\\n driver_unregister+0x30/0x60\\n platform_driver_unregister+0x14/0x20\\n tidss_platform_driver_exit+0x18/0xb2c [tidss]\\n __arm64_sys_delete_module+0x1a0/0x2b4\\n invoke_syscall+0x48/0x110\\n el0_svc_common.constprop.0+0x60/0x10c\\n do_el0_svc_compat+0x1c/0x40\\n el0_svc_compat+0x40/0xac\\n el0t_32_sync_handler+0xb0/0x138\\n el0t_32_sync+0x194/0x198\\nCode: 9104a276 f2fbd5b7 aa0203e1 91008af8 (f85c0420)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/bridge: lt8912b: soluciona el fallo al desconectar el puente. El controlador lt8912b, en su funci\u00f3n de desconectar el puente, llama a drm_connector_unregister() y drm_connector_cleanup(). drm_connector_unregister() debe llamarse solo para conectores registrados expl\u00edcitamente con drm_connector_register(), lo cual no es el caso en lt8912b. El gancho drm_connector_funcs.destroy del controlador est\u00e1 configurado en drm_connector_cleanup(). Por lo tanto, el controlador no debe llamar ni a drm_connector_unregister() ni a drm_connector_cleanup() en su lt8912_bridge_detach(), ya que causan un bloqueo al desconectar el puente: No se puede manejar la desreferencia del puntero NULL del n\u00facleo en la direcci\u00f3n virtual 00000000000000000 Informaci\u00f3n de cancelaci\u00f3n de memoria: ESR = 0x0000000096000006 EC = 0x25 : DABT (EL actual), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: fallo de traducci\u00f3n de nivel 2 Informaci\u00f3n de cancelaci\u00f3n de datos: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 tabla de p\u00e1ginas de usuario: p\u00e1ginas de 4k, VA de 48 bits, pgdp=00000000858f3000 [0000000000000000000000000859180] 03, p4d =0800000085918003, pud=0800000085431003, pmd=0000000000000000 Error interno: Ups: 0000000096000006 [#1] M\u00f3dulos SMP PREEMPT vinculados en: tidss(-) display_connector lontium_lt8912b tc35876 8 panel_lvds panel_simple drm_dma_helper drm_kms_helper drm drm_panel_orientation_quirks CPU: 3 PID: 462 Comunicaciones: rmmod Contaminado: GW 6.5.0-rc2+ #2 Nombre del hardware: Toradex Verdin AM62 en la placa de desarrollo Verdin (DT) pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc: drm_connector_cleanup+0x78/0x2d4 [ drm] lr: lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b] sp: ffff800082ed3a90 x29: ffff800082ed3a90 x28: ffff0000040c1940 x27: 0000000000000000 x26: 00000000000 x25: dead000000000122 x24: dead000000000122 x23: dead000000000100 x22: ffff000003fb6388 x21: 0000000000000000 x20: 00000000000000000 x 19: ffff000003fb6260 x18: fffffffffffe56e8 x17: 0000000000000000 x16: 0010000000000000 x15: 0000000000000038 x14: 00000000000000000 x13: ffff800081914b48 x12: 0000000040e x11: 000000000000015a x10: ffff80008196ebb8 x9: ffff800081914b48 x8: 00000000fffffff x7: ffff0000040c1940 x6: ffff80007aa649d0 0000000000000000 x4: 0000000000000001 x3: ffff80008159e008 x2: 0000000000000000 x1 : 0000000000000000 x0 : 00000000000000000 Rastreo de llamadas: drm_connector_cleanup+0x78/0x2d4 [drm] lt8912_bridge_detach+0x54/0x6c [lontium_lt8912b] drm_bridge_detach+0x44/0x84 [drm_encoder] _cleanup+0x40/0xb8 [drm] drmm_encoder_alloc_release+0x1c/0x30 [drm] drm_managed_release+ 0xac/0x148 [drm] drm_dev_put.part.0+0x88/0xb8 [drm] devm_drm_dev_init_release+0x14/0x24 [drm] devm_action_release+0x14/0x20 release_nodes+0x5c/0x90 devres_release_all+0x8c/0xe0 device_unbind_cleanup +0x18/0x68 device_release_driver_internal+0x208/ 0x23c driver_detach+0x4c/0x94 bus_remove_driver+0x70/0xf4 driver_unregister+0x30/0x60 platform_driver_unregister+0x14/0x20 tidss_platform_driver_exit+0x18/0xb2c [tidss] __arm64_sys_delete_module+0x1a0/0 x2b4 invoke_syscall+0x48/0x110 el0_svc_common.constprop.0+0x60/0x10c do_el0_svc_compat+ 0x1c/0x40 el0_svc_compat+0x40/0xac el0t_32_sync_handler+0xb0/0x138 el0t_32_sync+0x194/0x198 C\u00f3digo: 9104a276 f2fbd5b7 aa0203e1 91008af8 (f85c0420)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/42071feab712ba2a139b8928f7e0f8d3a6fc719e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44283993144a03af9df31934d6c32bbd42d1a347\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bf0cb8f40280a85034990dfe42be8ca8f80f37a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b65e3249f3ca96e3c736af889461d80d675feab6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fcd9895e365474709844eeb31cfe53d912c3596e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/42071feab712ba2a139b8928f7e0f8d3a6fc719e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/44283993144a03af9df31934d6c32bbd42d1a347\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7bf0cb8f40280a85034990dfe42be8ca8f80f37a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b65e3249f3ca96e3c736af889461d80d675feab6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/fcd9895e365474709844eeb31cfe53d912c3596e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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