fbdev: smscufx: fix error handling code in ufx_usb_probe(CVE-2022-49741)

概要

fbdev: smscufx: fix error handling code in ufx_usb_probe

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

In the Linux kernel, the following vulnerability has been resolved:

fbdev: smscufx: fix error handling code in ufx_usb_probe

The current error handling code in ufx_usb_probe have many unmatching
issues, e.g., missing ufx_free_usb_list, destroy_modedb label should
only include framebuffer_release, fb_dealloc_cmap only matches
fb_alloc_cmap.

My local syzkaller reports a memory leak bug:

memory leak in ufx_usb_probe

BUG: memory leak
unreferenced object 0xffff88802f879580 (size 128):
comm "kworker/0:7", pid 17416, jiffies 4295067474 (age 46.710s)
hex dump (first 32 bytes):
80 21 7c 2e 80 88 ff ff 18 d0 d0 0c 80 88 ff ff .!|.............
00 d0 d0 0c 80 88 ff ff e0 ff ff ff 0f 00 00 00 ................
backtrace:
[] kmalloc_trace+0x20/0x90 mm/slab_common.c:1045
[] kmalloc include/linux/slab.h:553 [inline]
[] kzalloc include/linux/slab.h:689 [inline]
[] ufx_alloc_urb_list drivers/video/fbdev/smscufx.c:1873 [inline]
[] ufx_usb_probe+0x11c/0x15a0 drivers/video/fbdev/smscufx.c:1655
[] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
[] call_driver_probe drivers/base/dd.c:560 [inline]
[] really_probe+0x12d/0x390 drivers/base/dd.c:639
[] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:778
[] driver_probe_device+0x2a/0x120 drivers/base/dd.c:808
[] __device_attach_driver+0xf7/0x150 drivers/base/dd.c:936
[] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
[] __device_attach+0x105/0x2d0 drivers/base/dd…

出典: OSV.dev (Open Source Vulnerabilities) NVD OSV

影響パッケージ

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.232"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.11"}]}]

ディストリビューション別の修正状況

各ディストリビューションが公開している、この CVE の修正パッケージ

Debian DEBIAN-CVE-2022-49741 linux 修正版: 5.10.178-1
Ubuntu UBUNTU-CVE-2022-49741 linux

概要

原文の説明

影響パッケージ

ディストリビューション別の修正状況

参照URL