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Change History

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

spi: spi-sprd-adi: Fix double free in probe error path

The driver currently uses spi_alloc_host() to allocate the controller
but registers it using devm_spi_register_controller().

If devm_register_restart_handler() fails, the code jumps to the
put_ctlr label and calls spi_controller_put(). However, since the
controller was registered via a devm function, the device core will
automatically call spi_controller_put() again when the probe fails.
This results in a double-free of the spi_controller structure.

Fix this by switching to devm_spi_alloc_host() and removing the
manual spi_controller_put() call.

https://git.kernel.org/stable/c/346775f2b4cf839177e8e86b94aa180a06dc15b0

https://git.kernel.org/stable/c/383d4f5cffcc8df930d95b06518a9d25a6d74aac

https://git.kernel.org/stable/c/417cdfd9b9f986e95bfcb1d68eb443e6e0a15f8c

https://git.kernel.org/stable/c/f6d6b3f172df118db582fe5ec43ae223a55d99cf