[SRU][F][PATCH 0/1] CVE-2024-42244

[Bethany Jamison]

[Impact]

USB: serial: mos7840: fix crash on resume

Since commit c49cfa9 ("USB: serial: use generic method if no
alternative is provided in usb serial layer"), USB serial core calls the
generic resume implementation when the driver has not provided one.

This can trigger a crash on resume with mos7840 since support for
multiple read URBs was added back in 2011. Specifically, both port read
URBs are now submitted on resume for open ports, but the context pointer
of the second URB is left set to the core rather than mos7840 port
structure.

Fix this by implementing dedicated suspend and resume functions for
mos7840.

Tested with Delock 87414 USB 2.0 to 4x serial adapter.

[Fix]

Noble:	pending (6.8.0-46.46)
Jammy:	released
Focal:	Backported from linux-5.10.y - I adjusted the code to ignore a 
	context conflict, Focal has '.read_int_callback' line which isn't 
	upstream
Bionic:	fix sent to esm ML
Xenial:	fix needed
Trusty:	won't fix

[Test Case]

Compile tested.

[Where problems could occur]

This fix affects those who use the Moschip 7840/7820 USB Serial Driver,
an issue with this fix would be visible to the user via a system crash.

Dmitry Smirnov (1):
  USB: serial: mos7840: fix crash on resume

 drivers/usb/serial/mos7840.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

-- 
2.34.1