"value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/bridge: sii902x: Fix probing race issue\n\nA null pointer dereference crash has been observed rarely on TI\nplatforms using sii9022 bridge:\n\n[ 53.271356] sii902x_get_edid+0x34/0x70 [sii902x]\n[ 53.276066] sii902x_bridge_get_edid+0x14/0x20 [sii902x]\n[ 53.281381] drm_bridge_get_edid+0x20/0x34 [drm]\n[ 53.286305] drm_bridge_connector_get_modes+0x8c/0xcc [drm_kms_helper]\n[ 53.292955] drm_helper_probe_single_connector_modes+0x190/0x538 [drm_kms_helper]\n[ 53.300510] drm_client_modeset_probe+0x1f0/0xbd4 [drm]\n[ 53.305958] __drm_fb_helper_initial_config_and_unlock+0x50/0x510 [drm_kms_helper]\n[ 53.313611] drm_fb_helper_initial_config+0x48/0x58 [drm_kms_helper]\n[ 53.320039] drm_fbdev_dma_client_hotplug+0x84/0xd4 [drm_dma_helper]\n[ 53.326401] drm_client_register+0x5c/0xa0 [drm]\n[ 53.331216] drm_fbdev_dma_setup+0xc8/0x13c [drm_dma_helper]\n[ 53.336881] tidss_probe+0x128/0x264 [tidss]\n[ 53.341174] platform_probe+0x68/0xc4\n[ 53.344841] really_probe+0x188/0x3c4\n[ 53.348501] __driver_probe_device+0x7c/0x16c\n[ 53.352854] driver_probe_device+0x3c/0x10c\n[ 53.357033] __device_attach_driver+0xbc/0x158\n[ 53.361472] bus_for_each_drv+0x88/0xe8\n[ 53.365303] __device_attach+0xa0/0x1b4\n[ 53.369135] device_initial_probe+0x14/0x20\n[ 53.373314] bus_probe_device+0xb0/0xb4\n[ 53.377145] deferred_probe_work_func+0xcc/0x124\n[ 53.381757] process_one_work+0x1f0/0x518\n[ 53.385770] worker_thread+0x1e8/0x3dc\n[ 53.389519] kthread+0x11c/0x120\n[ 53.392750] ret_from_fork+0x10/0x20\n\nThe issue here is as follows:\n\n- tidss probes, but is deferred as sii902x is still missing.\n- sii902x starts probing and enters sii902x_init().\n- sii902x calls drm_bridge_add(). Now the sii902x bridge is ready from\n DRM's perspective.\n- sii902x calls sii902x_audio_codec_init() and\n platform_device_register_data()\n- The registration of the audio platform device causes probing of the\n deferred devices.\n- tidss probes, which eventually causes sii902x_bridge_get_edid() to be\n called.\n- sii902x_bridge_get_edid() tries to use the i2c to read the edid.\n However, the sii902x driver has not set up the i2c part yet, leading\n to the crash.\n\nFix this by moving the drm_bridge_add() to the end of the\nsii902x_init(), which is also at the very end of sii902x_probe()."
"value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/bridge: sii902x: soluciona el problema de carrera de sondeo. Rara vez se ha observado un fallo de desreferencia de puntero nulo en plataformas TI que utilizan el puente sii9022: [ 53.271356] sii902x_get_edid+0x34/0x70 [sii902x] [ 53.276066] sii902x_bridge_get_edid+0x14/0x20 [sii902x] [ 53.281381] drm_bridge_get_edid+0x20/0x34 [drm] [ 53.286305] drm_bridge_connector_get_modes+0x8c/0xcc [drm_kms_helper] [ 53 .292955] drm_helper_probe_single_connector_modes+0x190/0x538 [drm_kms_helper] [ 53.300510] drm_client_modeset_probe+0x1f0/ 0xbd4 [drm] [ 53.305958] __drm_fb_helper_initial_config_and_unlock+0x50/0x510 [drm_kms_helper] [ 53.313611] drm_fb_helper_initial_config+0x48/0x58 [drm_kms_helper] [ 53.320039] drm_f bdev_dma_client_hotplug+0x84/0xd4 [drm_dma_helper] [ 53.326401] drm_client_register+0x5c/0xa0 [drm] [ 53.331216 ] drm_fbdev_dma_setup+0xc8/0x13c [drm_dma_helper] [ 53.336881] tidss_probe+0x128/0x264 [tidss] [ 53.341174] platform_probe+0x68/0xc4 [ 53.344841] very_probe+0x188/0x3 c4 [ 53.348501] __driver_probe_device+0x7c/0x16c [ 53.352854] driver_probe_device+0x3c /0x10c [ 53.357033] __device_attach_driver+0xbc/0x158 [ 53.361472] bus_for_each_drv+0x88/0xe8 [ 53.365303] __device_attach+0xa0/0x1b4 [ 53.369135] dispositivo_initial_probe+0x14/0 x20 [ 53.373314] dispositivo_probe_bus+0xb0/0xb4 [ 53.377145] funci\u00f3n_trabajo_probe_diferida+0xcc/0x124 [ 53.381757] Process_one_work+0x1f0/0x518 [ 53.385770] Worker_thread+0x1e8/0x3dc [ 53.389519] kthread+0x11c/0x120 [ 53.392750] ret_from_fork+0x10/0x20 El problema aqu\u00ed es el siguiente: - tids s, pero se pospone ya que sii902x todav\u00eda est\u00e1 desaparecido. - sii902x comienza a sondear e ingresa sii902x_init(). - sii902x llama a drm_bridge_add(). Ahora el puente sii902x est\u00e1 listo desde la perspectiva de DRM. - sii902x llama a sii902x_audio_codec_init() y platform_device_register_data() - El registro del dispositivo de plataforma de audio provoca el sondeo de los dispositivos diferidos. - sondas tidss, que eventualmente provocan que se llame a sii902x_bridge_get_edid(). - sii902x_bridge_get_edid() intenta usar i2c para leer el edit. Sin embargo, el controlador sii902x a\u00fan no ha configurado la parte i2c, lo que provoc\u00f3 el fallo. Solucione este problema moviendo drm_bridge_add() al final de sii902x_init(), que tambi\u00e9n est\u00e1 al final de sii902x_probe()."
