fbdev: smscufx: fix error handling code in ufx_usb_probe
Summary
fbdev: smscufx: fix error handling code in ufx_usb_probe
Original description
The description as published by the source.
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…
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2022-49741 linux Fixed in: 5.10.178-1
- Ubuntu UBUNTU-CVE-2022-49741 linux
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org