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wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7615_rx_check() and mt7615_queue_rx_skb() dispatch it to mt7615_mac_tx_free() on every bus. mt7615_mac_tx_free() cleans the DMA tx queues with mt76_queue_tx_cleanup(), which calls queue_ops->tx_cleanup(). Only the mmio queue ops implement that callback; on the mt7663 USB and SDIO buses it is NULL, so a TXRX_NOTIFY there calls a NULL pointer in the RX worker. Same defect as the mt7921 and mt7925 patches in this series. Drop the event on non-mmio buses via mt76_is_mmio(), as in commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for non-mmio devices").

Affected products

Linux
  • <39afc46c0243d10b7795e6e6cf4ae91f41732120
  • <b2ab73b8123ce6cf2bc32634bfee4928676ffa66
  • =<6.6.*
  • <5.8
  • =<*
  • =<6.18.*
  • ==5.8
  • =<6.12.*
  • <f2a72f47c5fb4ba6887e85bbe809d7e5b318d9d5
  • =<7.1.*
  • <88c98ef247a3126fea9bbbda953a18a2f36c3ea7
  • <ab4d213393e846baa6437497f94dda7553cbeda7