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bluetooth:hci_uart: add missing NULL check in h5_enqueue

Mikhail Vanyulin requested to merge linux-5.15.32-seco-fix-tanaro-bluetooth into linux-5.15.32-seco

This is a fix for issue with id 746-001125: Tanaro: Bluetooth does not work

This is a cherry-pick of the following commit: 141112df59850e0f5e2410828524a1de0bafd7db

Bluetooth: hci_uart: add missing NULL check in h5_enqueue

[ Upstream commit 32cb08e9 ]

Syzbot hit general protection fault in __pm_runtime_resume(). The problem was in missing NULL check.

hu->serdev can be NULL and we should not blindly pass &serdev->dev somewhere, since it will cause GPF.

Edited by Mikhail Vanyulin

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