Vulnerabilidad en kernel de Linux (CVE-2021-47133)

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: HID: amd_sfh: Reparar pérdida de memoria en amd_sfh_work La herramienta Kmemleak detectó una pérdida de memoria en el controlador amd_sfh. ==================== objeto sin referencia 0xffff88810228ada0 (tamaño 32): comm "insmod", pid 3968, jiffies 4295056001 (edad 775,792 s) volcado hexadecimal (primeros 32 bytes) : 00 20 73 1f 81 88 ff ff 00 01 00 00 00 00 ad de . s................. 22 01 00 00 00 00 ad de 01 00 02 00 00 00 00 00 "................. retroceso: [< 000000007b4c8799>] kmem_cache_alloc_trace+0x163/0x4f0 [<0000000005326893>] amd_sfh_get_report+0xa4/0x1d0 [amd_sfh] [<000000002a9e5ec4>] amdtp_hid_request+0x6 2/0x80 [amd_sfh] [<00000000b8a95807>] sensor_hub_get_feature+0x145/0x270 [hid_sensor_hub] [<00000000fda054ee >] hid_sensor_parse_common_attributes+0x215/0x460 [hid_sensor_iio_common] [<0000000021279ecf>] hid_accel_3d_probe+0xff/0x4a0 [hid_sensor_accel_3d] [<00000000915760ce>] platform_probe+0x6a/0xd0 [ <0000000060258a1f>] very_probe+0x192/0x620 [<00000000fa812f2d>] driver_probe_device+ 0x14a/0x1d0 [<000000005e79f7fd>] __device_attach_driver+0xbd/0x110 [<0000000070d15018>] bus_for_each_drv+0xfd/0x160 [<0000000013a3c312>] __device_attach+0x1 8b/0x220 [<000000008c7b4afc>] dispositivo_sonda_inicial+0x13/0x20 [<00000000e6e99665>] bus_probe_dispositivo+ 0xfe/0x120 [<00000000833fa90b>] device_add+0x6a6/0xe00 [<00000000fa901078>] platform_device_add+0x180/0x380 ===================== La solución es liberar la entrada request_list una vez que la entrada procesada se elimina de request_list.