Vulnerability CVE-2024-27001
Published: 2024-05-01

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

comedi: vmk80xx: fix incomplete endpoint checking

While vmk80xx does have endpoint checking implemented, some things
can fall through the cracks. Depending on the hardware model,
URBs can have either bulk or interrupt type, and current version
of vmk80xx_find_usb_endpoints() function does not take that fully
into account. While this warning does not seem to be too harmful,
at the very least it will crash systems with 'panic_on_warn' set on
them.

Fix the issue found by Syzkaller [1] by somewhat simplifying the
endpoint checking process with usb_find_common_endpoints() and
ensuring that only expected endpoint types are present.

This patch has not been tested on real hardware.

[1] Syzkaller report:
usb 1-1: BOGUS urb xfer, pipe 1 != type 3
WARNING: CPU: 0 PID: 781 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503
...
Call Trace:
<TASK>
usb_start_wait_urb+0x113/0x520 drivers/usb/core/message.c:59
vmk80xx_reset_device drivers/comedi/drivers/vmk80xx.c:227 [inline]
vmk80xx_auto_attach+0xa1c/0x1a40 drivers/comedi/drivers/vmk80xx.c:818
comedi_auto_config+0x238/0x380 drivers/comedi/drivers.c:1067
usb_probe_interface+0x5cd/0xb00 drivers/usb/core/driver.c:399
...

Similar issue also found by Syzkaller:

 References:
https://git.kernel.org/stable/c/b0b268eeb087e324ef3ea71f8e6cabd07630517f
https://git.kernel.org/stable/c/ac882d6b21bffecb57bcc4486701239eef5aa67b
https://git.kernel.org/stable/c/59f33af9796160f851641d960bd93937f282c696
https://git.kernel.org/stable/c/6ec3514a7d35ad9cfab600187612c29f669069d2
https://git.kernel.org/stable/c/d1718530e3f640b7d5f0050e725216eab57a85d8
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