spi: oc-tiny: switch to managed controller allocation

Summary

In the Linux kernel, the following vulnerability has been resolved: spi: oc-tiny: switch to managed controller allocation The controller is allocated with the non-managed spi_alloc_host() while the interrupt is registered with devm_request_irq(). During removal, spi_bitbang_stop() only unregisters the controller; the subsequent spi_controller_put() then frees the controller together with its embedded driver-private devdata, which is the IRQ handler's dev_id. The devm_request_irq() release action (free_irq()), which drains the handler, does not run until after .remove() returns. A late or latched interrupt can therefore reach tiny_spi_irq() and dereference already-freed memory (e.g. hw->base). 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. This issue was found by an in-house static analysis tool.

Timeline

1. Sep 17, 2026, 4:09 PM UTCCVE published
2. Oct 21, 2026, 12:51 PM UTCRecord last updated

Affected versions

• Linux Linux

  From ce792580ea2ce6f7259b45124e9ccc4574c31606 · fixed in 9265fa8190312b87637def1382d36fc16de3b8e8; From ce792580ea2ce6f7259b45124e9ccc4574c31606 · fixed in 0260c94453a08491640e61f8cf0c384edbe7bd11; From ce792580ea2ce6f7259b45124e9ccc4574c31606 · fixed in ef5cc4a8c088d05549f71950a72b5deff5000fd7; From ce792580ea2ce6f7259b45124e9ccc4574c31606 · fixed in 1cd16c8d68f58e54abb8f331d05469237200631f; From ce792580ea2ce6f7259b45124e9ccc4574c31606 · fixed in d710f43ce30975d197f73c543bfe47b958d8ba17

• Linux Linux

  2.6.39

• KernelLinux

  From 2.6.39 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 5