[Bug 1931855] Re: UAF on CAN BCM bcm_rx_handler

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
hirsute' to 'verification-done-hirsute'. If the problem still exists,
change the tag 'verification-needed-hirsute' to 'verification-failed-
hirsute'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-hirsute

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https://bugs.launchpad.net/bugs/1931855

Title:
UAF on CAN BCM bcm_rx_handler

Status in linux package in Ubuntu:
Fix Released

Bug description:
[Impact]
bcm_rx_handler may run concurrently to can_rx_unregister on bcm_release, which will, then, free the bcm_op that is used by bcm_rx_handler, leading to a system crash.

[Potential regression]
CAN BCM sockets may stop working as expected.

[Test case]
Programs from can-utils were run, some of them concurrently.

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