Description

In the Linux kernel, the following vulnerability has been resolved: spi: atmel-quadspi: Free resources even if runtime resume failed in .remove() An early error exit in atmel_qspi_remove() doesn't prevent the device unbind. So this results in an spi controller with an unbound parent and unmapped register space (because devm_ioremap_resource() is undone). So using the remaining spi controller probably results in an oops. Instead unregister the controller unconditionally and only skip hardware access and clk disable. Also add a warning about resume failing and return zero unconditionally. The latter has the only effect to suppress a less helpful error message by the spi core.

References 4

• git.kernel.org https://git.kernel.org/stable/c/618770d4d8e40b7f8ed9eb5f210cd9164dfac47d
• git.kernel.org https://git.kernel.org/stable/c/77806d7c9bebe40a8cdce2b8d30fbe6511745df8
• git.kernel.org https://git.kernel.org/stable/c/9448bc1dee65f86c0fe64d9dea8b410af0586886
• git.kernel.org https://git.kernel.org/stable/c/f6974fb20499e3b6522daa7aec822aac11dfcf42

Remediation