In the Linux kernel, the following vulnerability has been resolved:
firewire: cdev: fix back-transition for iso_resource_auto client resource
The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order:
ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC
However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC.
Prevent the back-transition by checking the current state before updating it in the work item.
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