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kernel: pvrusb2: fix use after free on context disconnection

Desnes Nunes requested to merge desnesn/centos-stream-9:rhel27529 into main

JIRA: https://issues.redhat.com/browse/RHEL-27529

CVE: CVE-2023-52445

BUILD INFO: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=59757836

FUNCTIONAL TESTING: QA

DESCRIPTION: This fixes a possible invalid read within the context disconnection call stack, which can be triggered due to a syncronization issue between the usb hub_event handler and the pvrusb2 driver.

Signed-off-by: Desnes Nunes desnesn@redhat.com

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