Vulnerabilidad en kernel de Linux (CVE-2022-48995)

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Entrada: raydium_ts_i2c - arregla pérdida de memoria en raydium_i2c_send() Hay una pérdida de kmem cuando se prueba raydium_i2c_ts con bpf mock device: unreferenced object 0xffff88812d3675a0 (size 8): comm "python3", pid 349, jiffies 4294741067 (age 95.695s) hex dump (first 8 bytes): 11 0e 10 c0 01 00 04 00 ........ backtrace: [<0000000068427125>] __kmalloc+0x46/0x1b0 [<0000000090180f91>] raydium_i2c_send+0xd4/0x2bf [raydium_i2c_ts] [<000000006e631aee>] raydium_i2c_initialize.cold+0xbc/0x3e4 [raydium_i2c_ts] [<00000000dc6fcf38>] raydium_i2c_probe+0x3cd/0x6bc [raydium_i2c_ts] [<00000000a310de16>] i2c_device_probe+0x651/0x680 [<00000000f5a96bf3>] really_probe+0x17c/0x3f0 [<00000000096ba499>] __driver_probe_device+0xe3/0x170 [<00000000c5acb4d9>] dispositivo_de_sonda_de_controlador+0x49/0x120 [<00000000264fe082>] __controlador_de_adjuntar_dispositivo+0xf7/0x150 [<00000000f919423c>] bus_para_cada_unidad+0x114/0x180 [<00000000e067feca>] __adjuntar_dispositivo+0x1e5/0x2d0 [<0000000054301fc2>] dispositivo_de_sonda_de_bus+0x126/0x140 [<00000000aad93b22>] dispositivo_agregar+0x810/0x1130 [<00000000c086a53f>] i2c_new_client_device+0x352/0x4e0 [<000000003c2c248c>] of_i2c_register_device+0xf1/0x110 [<00000000ffec4177>] of_i2c_notify+0x100/0x160 objeto sin referencia 0xffff88812d3675c8 (tamaño 8): comm "python3", pid 349, jiffies 4294741070 (antigüedad 95,692 s) volcado hexadecimal (primeros 8 bytes): 22 00 36 2d 81 88 ff ff ".6-.... traza inversa: [<0000000068427125>] __kmalloc+0x46/0x1b0 [<0000000090180f91>] raydium_i2c_send+0xd4/0x2bf [raydium_i2c_ts] [<000000001d5c9620>] raydium_i2c_initialize.cold+0x223/0x3e4 [raydium_i2c_ts] [<00000000dc6fcf38>] raydium_i2c_probe+0x3cd/0x6bc [raydium_i2c_ts] [<00000000a310de16>] i2c_device_probe+0x651/0x680 [<00000000f5a96bf3>] realmente_sondeo+0x17c/0x3f0 [<00000000096ba499>] __dispositivo_de_sonda_de_controlador+0xe3/0x170 [<00000000c5acb4d9>] dispositivo_de_sonda_de_controlador+0x49/0x120 [<00000000264fe082>] __dispositivo_adjunto_controlador+0xf7/0x150 [<00000000f919423c>] bus_para_cada_unidad+0x114/0x180 [<00000000e067feca>] __dispositivo_adjunto+0x1e5/0x2d0 [<0000000054301fc2>] bus_probe_device+0x126/0x140 [<00000000aad93b22>] device_add+0x810/0x1130 [<00000000c086a53f>] i2c_new_client_device+0x352/0x4e0 [<000000003c2c248c>] of_i2c_register_device+0xf1/0x110 [<00000000ffec4177>] of_i2c_notify+0x100/0x160 Después del comando BANK_SWITCH del BUS i2c, sin importar si se produjo un éxito o un error, se debe liberar el tx_buf.