CVE-2026-68403: wifi: brcmfmac: initialize SDIO data work before cleanup

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

wifi: brcmfmac: initialize SDIO data work before cleanup

brcmfsdioprobe() stores the newly allocated bus in sdiodev->bus before allocating the ordered workqueue. If that allocation fails, the function jumps to fail and calls brcmfsdioremove().

brcmfsdioremove() unconditionally cancels bus->datawork. Initialize the work item before the first failure path that can reach brcmfsdioremove(), so the cleanup path always observes a valid work object.

This issue was found by our static analysis tool and then confirmed by manual review of the probe error path and the remove-time work drain. The problem pattern is an early setup failure that reaches a cleanup helper which cancels an embedded work item before its initializer has run.

A QEMU PoC forced allocorderedworkqueue() to fail at the same point in brcmfsdioprobe(), before INITWORK(&bus->datawork) is reached. The resulting fail path calls brcmfsdioremove(), and DEBUGOBJECTS reports the invalid work drain with brcmfsdioprobe() and brcmfsdioremove() in the stack.