CVE-2022-48871

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer<br /> <br /> Driver&amp;#39;s probe allocates memory for RX FIFO (port-&gt;rx_fifo) based on<br /> default RX FIFO depth, e.g. 16. Later during serial startup the<br /> qcom_geni_serial_port_setup() updates the RX FIFO depth<br /> (port-&gt;rx_fifo_depth) to match real device capabilities, e.g. to 32.<br /> <br /> The RX UART handle code will read "port-&gt;rx_fifo_depth" number of words<br /> into "port-&gt;rx_fifo" buffer, thus exceeding the bounds. This can be<br /> observed in certain configurations with Qualcomm Bluetooth HCI UART<br /> device and KASAN:<br /> <br /> Bluetooth: hci0: QCA Product ID :0x00000010<br /> Bluetooth: hci0: QCA SOC Version :0x400a0200<br /> Bluetooth: hci0: QCA ROM Version :0x00000200<br /> Bluetooth: hci0: QCA Patch Version:0x00000d2b<br /> Bluetooth: hci0: QCA controller version 0x02000200<br /> Bluetooth: hci0: QCA Downloading qca/htbtfw20.tlv<br /> bluetooth hci0: Direct firmware load for qca/htbtfw20.tlv failed with error -2<br /> Bluetooth: hci0: QCA Failed to request file: qca/htbtfw20.tlv (-2)<br /> Bluetooth: hci0: QCA Failed to download patch (-2)<br /> ==================================================================<br /> BUG: KASAN: slab-out-of-bounds in handle_rx_uart+0xa8/0x18c<br /> Write of size 4 at addr ffff279347d578c0 by task swapper/0/0<br /> <br /> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.0-rt5-00350-gb2450b7e00be-dirty #26<br /> Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)<br /> Call trace:<br /> dump_backtrace.part.0+0xe0/0xf0<br /> show_stack+0x18/0x40<br /> dump_stack_lvl+0x8c/0xb8<br /> print_report+0x188/0x488<br /> kasan_report+0xb4/0x100<br /> __asan_store4+0x80/0xa4<br /> handle_rx_uart+0xa8/0x18c<br /> qcom_geni_serial_handle_rx+0x84/0x9c<br /> qcom_geni_serial_isr+0x24c/0x760<br /> __handle_irq_event_percpu+0x108/0x500<br /> handle_irq_event+0x6c/0x110<br /> handle_fasteoi_irq+0x138/0x2cc<br /> generic_handle_domain_irq+0x48/0x64<br /> <br /> If the RX FIFO depth changes after probe, be sure to resize the buffer.