CVE-2026-90410spi: davinci: switch to managed controller allocation

Official description

In the Linux kernel, the following vulnerability has been resolved: spi: davinci: switch to managed controller allocation The controller is allocated with the non-managed spi_alloc_host() while the interrupt is registered with devm_request_threaded_irq(). During removal, spi_bitbang_stop() only unregisters the controller; the subsequent spi_controller_put() then frees the controller together with its embedded davinci_spi devdata, which is the IRQ handler's dev_id. The devm_request_threaded_irq() release action (free_irq()), which drains the handler, does not run until after .remove() returns. A late or latched interrupt can therefore reach davinci_spi_irq() and dereference already-freed memory. Switch to devm_spi_alloc_host() so that the devres LIFO order releases the controller only after free_irq() has drained the handler, and drop the now-redundant spi_controller_put() from .remove(). The probe error path is simplified to direct returns. The clock is acquired with devm_clk_get_enabled(), which is registered after the IRQ and thus released before it by the devres LIFO order. Drain the interrupt explicitly with devm_free_irq() before disabling the controller so that a late interrupt cannot access the registers of a clock-gated controller. This issue was found by an in-house static analysis tool.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/2382f18daa4303923d66526db984e9a38074a312
• https://git.kernel.org/stable/c/29e37f768f35592e26477f703649bd2e6f18d857
• https://git.kernel.org/stable/c/f9452eba71fbfcee55c0b8e030ee3615e9f75f65
• https://git.kernel.org/stable/c/3b544072185c3d19ddec621ec9f6897ea2d10ee3
• https://git.kernel.org/stable/c/1a7958ce58dc95b06615df00c120ece4eb9ccc86
• https://git.kernel.org/stable/c/ea408a05dc8f18b4a184b88d6e19d2fd1acc1527